“fun / music” in Japanese is 楽, read gaku, raku, tano (がく, らく, たの). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 音楽 (music).
What does 楽 mean?
音楽が好きだ。
Same sound, different character — the classic trap. Compare them side by side: