How many letters does the top answer for “album by cast” have?

The most common answer is highschoolmusical (17 letters).

Crossword clue: album by cast

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

highschoolmusical 17 letters wd-fact-v3

album by that 50% similar → beautifulworld, everythingchanges, nobodyelse

album by who 50% similar → aquickone, endlesswire, facedances