Tuneful describes music, singing, or any sound that is pleasant to listen to because it has a clear, nice melody you can follow. The word is really saying: this has a good tune in it. You use it about songs, about a musical, about someone's voice, about a bird singing outside your window. There is a particular flavour to this word that a dictionary line does not show you. Tuneful is usually praise, but it is gentle, slightly old-fashioned praise — the kind of word you find in a newspaper review or from an older speaker, not something a teenager says about a song they love. And critics sometimes use it with a small sting: calling a piece of music "tuneful" can quietly mean "pleasant, easy on the ear — but not deep, not important". So a reviewer might write that a musical was "tuneful but forgettable". Read the whole sentence before deciding how warm the compliment is. It also carries a hint of the traditional. Music described as tuneful tends to have melodies that go somewhere you can hum along with, as opposed to modern music that is deliberately difficult or built on rhythm rather than melody. Related forms: tunefully (the adverb) and tunefulness (the noun). The opposite is tuneless.

旋律優美的、好聽的（指有清楚好記的曲調）。中文說「很有旋律」「曲子很順耳」大概就是這個意思。要注意這個字有點文雅、偏書面，像樂評會用的詞；聽到喜歡的歌，年輕人講的是 catchy 或直接說 good，不太會說 tuneful。而且樂評用這個字有時候帶一點「好聽歸好聽，但不夠有深度」的意思。