Every composer
All 433 of them, with the dates and nationality we could source and how much of each one the library holds. Filter by letter or country, or sort by output to see who the collection is really built on.
Where the dates and countries come from
Dates come from two places, both cited. For the 177 composers with a written biography on this site, the birth and death years are read straight back out of that biography. For another 152 they come from Wikidata, accepted only where exactly one person with a composing occupation carries that name and both dates — the item id is kept so any entry can be checked. That leaves 104 composers, mostly with one or two pieces each, whose dates we could not source. They are listed here without them rather than with a guess.
Nationality is Wikidata's citizenship field, and for this repertoire that means a great many states that no longer exist: the Kingdom of Prussia, the Republic of Venice, Austria–Hungary, the United Kingdom of Great Britain and Ireland. Those are the facts, and a composer's page shows them as they are. The country column here is a coarser grouping made for browsing — "German lands", "Italian states", "British Isles" — because filtering by forty vanished polities helps nobody. Where a state genuinely spans several modern nations, it keeps its own name: the Holy Roman Empire stays the Holy Roman Empire.
What the numbers show
Sort by output and the shape of the library is immediate: Bach alone accounts for 373 pieces, more than the next four composers together, and the top twenty names carry over half the catalogue. The long tail is longer still — most composers here have one or two pieces, and those are usually the songs and salon pieces that survived in printed collections rather than in the concert repertoire.
If you would rather see all of this as a picture than a list, the Atlas plots the same composers as lifespans on one map.