#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
娯楽（ゴラク）: leisure, amusement
楽（たの）しい: enjoyable, fun
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