IPA: /ˈsɪŋəbl/
KK: /ˈsɪŋəbl/
Able to be sung or easily sung.
The melody of the song is very singable, making it popular among choirs.
Singable → It is formed from "sing" (from Old English "singan", meaning to produce musical sounds with the voice) and "-able" (meaning capable of). The word "singable" means capable of being sung or suitable for singing.
Think of the ability to 'produce musical sounds' ('sing') and that something 'capable of' ('-able') being sung is what makes it singable.