乐谱 (yuè pǔ) refers to written sheet music or a musical score — the physical notation of a piece. It contrasts with 乐曲 (yuè qǔ, HSK6), the musical composition itself. 谱 (pǔ, HSK7) is a shorter form for 'score' in casual speech, but also has broader meanings like a systematic list or chart, and can be a verb meaning 'to compose'.