* 歌 (gō) is the most common and general term for "song".
* 曲 (kēuk) is used for a more specific type of song, often a musical composition or melody.
* 首歌 (gō sek) means "a song".
* 首歌 (sau gō) also means "a song", but emphasizes the singular aspect.
The best way to choose the right word depends on what you're trying to say. For example, you could say:
* 我鍾意聽歌。 (Ngo zung yi ting gō.) I like listening to songs.
* 呢首曲好靚。 (Ni sau kēuk hou ling.) This song is very beautiful.
You can also use the English word "song" in Cantonese, but it is usually pronounced with a Cantonese accent.