The question I get asked most is not how a map is drawn. It is why something is missing from it. So here is exactly what gets left off a discography map, and the reasoning behind each decision, because the rules matter more than any individual print.
There are four of them, they apply to all seventy maps in the range, and one of them has an exception I break on purpose.
The short version. Studio albums become stations. Live albums and compilations are left off. A producer only becomes a line if the sleeve also credits them playing something. Track-level roles are left off every map except one. Where a sleeve is wrong or joking, the map prints the real name. Every rule below is illustrated with a real credit from my research sheets.
Rule One: Studio Albums Only, Which Is Why Some Records You Own Are Not Stations
The stations on a music map are studio albums, in chronological order. Live albums, compilations and B-sides collections are left off by editorial rule.
Take R.E.M. The map runs fifteen stations, Murmur in 1983 through to Collapse into Now in 2011. Dead Letter Office and Eponymous are not on it, and both are records plenty of R.E.M. fans own and love. They are a B-sides collection and a compilation, so neither earns a station.
The reasoning is about what a station means. If a compilation gets a station, then every musician on the original recordings gets counted twice, and the shape of the career stops being readable. You would see a bulge in the middle of the 1980s that represents nothing that happened.
This one has cost me a customer complaint, from someone who expected the live albums, so I say it plainly on every product page now. A map is the studio run, not the full catalogue.
Rule Two: A Producer Needs a Playing Credit
This is the rule that decides more inclusions and exclusions than any other, and it is the one people argue with most.
Produce a record, and you are not on the map. Produce it and play something, anything, and you are. The sleeve has to credit you with an instrument.
Mick Ronson produced Your Arsenal in 1992, one of the best records Morrissey ever made. He is not on the Morrissey map anywhere, because there is no playing credit next to his name. Stephen Street also produced and is on the map because he played bass and guitar. Same album cycle, same job title, different outcome.
R.E.M. is where the rule does its most visible work. Four producers appear as lines on that map, and the rest do not. Don Dixon played bass on "Perfect Circle". Mitch Easter played a guitar part backwards on the same track. Scott Litt is credited with an echo-loop feed on "Radio Song" and with harmonica and clavinet on Automatic for the People. Jacknife Lee played keyboards and guitar on Collapse into Now. All four qualify. Producers with no instrument next to their name do not.
The reason is that the map shows who made the sounds. A line running through five albums should mean five performances, not five sets of studio bookings. The moment you let production credits become lines, the busiest lines on every map belong to people who never touched an instrument, and the print stops being about music.
Rule Three: Track-Level Roles Are Left Off Everywhere Except One Map
A line tells you which albums a person appears on. It does not tell you what they played on each one.
That information exists in my research, and it is often the most interesting part. On Out of Time, Bill Berry is credited with drums, percussion, congas on "Low", bass guitar on two tracks, piano on another and backing vocals on three more. None of that reaches the print. The line just runs through the station.
There is exactly one exception in the whole range. The Rolling Stones Goats Head Soup album map shows every musician's role on every track, because it covers one record rather than a career, so there is room for it. If you want per-track detail, that is the only map that carries it.
The Exception I Break on Purpose: When a Live Album Earns a Station
Rule one has a hole in it, and the John Lydon map is where I cut it.
Three live records have stations on that print. Live in Tokyo from 1983 is there because it is the only place on the entire map where Joseph Guida and Tommy Zvoncheck appear. Leave it off, and two musicians vanish from Lydon's history altogether, which is a worse falsehood than the one the rule was written to prevent.
Filthy Lucre Live from 1996 remains for the same reason, just in a different shape. It is the only station where Glen Matlock, Steve Jones and Paul Cook stand alongside Lydon after 1977. Without it, the Sex Pistols reunion simply does not exist on the map.
So the working version of rule one is this: studio albums by default, and a live album only where excluding it would delete a person or a reunion from the record. That is a judgement. I make it case by case, and I would rather say so than pretend the rule is cleaner than it is.
What Does Not Get Left Off: The Nearly Empty Albums
There is a temptation to quietly drop the records where the paperwork is thin, because they make a print look sparse. I do not, and this is the decision I am most confident about.
The Lloyd Cole map has two stations that credit exactly one person. Plastic Wood in 2001 and 1D Electronics 2012-2014 in 2015 are instrumental electronic records that he made alone. They are the narrowest stations in my entire range, and they stay because a career that includes them is a different career from one that does not.
The Lainey Wilson map opens with four releases that name two people between them. That is not because two people made four records. It is because nobody was publishing the credits yet. Read left to right: that map shows an artist becoming documented, which is different from an artist becoming good. Starting in 2019, when the paperwork improved, would have made a tidier print and a more honest one.
What Happens When the Sleeve Is Joking or Wrong
Two smaller rules, both about trusting the source.
Where a sleeve credits someone under a joke name, the map uses the real one. On Some Time in New York City, ten musicians are credited under puns: Eric Clapton as "Derek Claptoe", Keith Moon as "Kief Spoon", Klaus Voormann as "Raus Doorman". On Fables of the Reconstruction, R.E.M. credit themselves as job titles, with Bill Berry as "WT Berry, Best Boy". Print those, and the map stops working, because the whole point is following one person from station to station, and "Derek Claptoe" leads nowhere.
Where a sleeve is simply wrong, the map corrects it. The Out of Time booklet attributes one of Kate Pierson's backing vocals to "Country Feedback" when she sang it on "Near Wild Heaven". Copying that error would have been faster. Checking it took an afternoon and changed one short line on the print.
Anything reading sleeves automatically would reproduce every joke and every mistake exactly as printed. That is the difference between a researched map and a generated one, and it is why I do this by hand.
Where a Map Has a Cutoff, It Is Stated
A map is finished on a date, and records keep arriving after it. The David Bowie map does not include Toy, released in 2021, because that record postdates the artwork. That is a cutoff rather than a judgement, and it belongs in the same list as everything above, because the honest answer to "why is this missing" is sometimes just "the print is older than the record".
I did something similar in reverse with The Fall and wrote up the reasoning separately in the post about not adding a 32nd station to The Fall map.
Common Questions About What Gets Left Off a Discography Map
Are live albums ever included?
Rarely, and only where leaving one off would remove a musician or a reunion line-up that appears nowhere else. The John Lydon map carries three live records for exactly that reason. Most maps carry none.
Why is the producer of my favourite album not on the map?
Because the sleeve does not credit them for playing anything. Production alone does not earn a line. If they played tambourine on one track, they are on it.
Are compilations and greatest hits albums stations?
No. They would double-count musicians already on the map from the original recordings, and they would distort the shape of their careers.
Does any map show who played what on each track?
One. The Rolling Stones' Goats Head Soup album map covers a single record, so there is room for track-level roles. Every other map shows which albums a person appears on, not what they played.
What happens if I spot something that should be there but isn't?
Tell me. Corrections sent in by collectors are how several maps have improved, and if a credit is genuinely documented and I have missed it, I would rather know.
Where to See the Rules in Practice
The R.E.M. map is the clearest illustration of the producer rule, showing four producers and leaving the rest absent. The John Lydon map is where the live album exception lives.
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