sing–along 
/ˈsɪŋəˌlɑ:ŋ/ noun
plural sing–alongs /ˈsɪŋəˌlɑ:ŋ/ noun [count] : an informal occasion or event at which people sing songs together
▪ a Christmas sing-along —called also (Brit) singsong; — see also sing along at sing
▪ a Christmas sing-along —called also (Brit) singsong; — see also sing along at sing
