This kanji is an ancient depiction of a stringed musical instrument, like a lute, on a stand. The top part suggests strings or ornamentation, and the bottom `木` (tree/wood) indicates the instrument's wooden body. This leads directly to the meaning of **music**.
'Raku' — When you're feeling **comfortable** and at **ease**, you don't have to RACK your brain thinking.
'Gaku' — Imagine a GUY playing **music** for everyone's enjoyment.