1. adjective /ˈsɪŋsɒŋ/
Like a piece of singsong; simple and melodic, varying in pitch (of tone of voice etc.)
2. noun /ˈsɪŋsɒŋ/
a) A piece of verse with a simple, song-like rhythm.
We gathered round the campfire for a little singsong.
b) An informal gathering at which songs are sung; a singing session.
Wikipedia foundation.