欢乐
huānlè · HSK 3
happy
🎉 欢 (joyful) + 乐 (happy/music) = double-dose of happy
欢乐 stacks two near-synonyms for joy: 欢 (huān, merry, as in 欢迎 welcome) and 乐 (lè, happy, also read yuè meaning music). Pairing them intensifies the meaning, like saying happy-joyous in English.
乐 — stylized depiction of a wooden instrument with strings
Originally a pictograph of a wooden frame holding strings or bells, representing a musical instrument. The character first meant 'music' (read yuè), and by extension came to mean 'joy, happiness' (read lè), since music brings pleasure. The simplified form 乐 streamlines the older 樂.