#楽 is listed under the radical of #木 but it is a pictograph depicting various musical instruments placed on the hanger (木).

I personally remember this as “a white (白) butterfly with wings (冫 and its mirror image) is having fun (楽) flying over a tree (木).”

楽 can mean “music” “ease” and/or “fun” and can be read as ガク（ガッ）、ラク（ラッ）or たの.

Were you able to read all of these words?

楽団（ガクダン）: a (music) band
楽器（ガッキ）: a musical instrument
音楽（オンガク）: music

楽園（ラクエン）: paradise
楽観（ラッカン）: optimism
快楽（カイラク）: pleasure
娯楽（ゴラク）: leisure, amusement
楽（ラク）（な）: effortless

楽（たの）しい: enjoyable, fun
楽（たの）しむ: enjoy

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