sing along
US /sɪŋ əˈlɔŋ/
UK /sɪŋ əˈlɔŋ/

1.
to sing a song with a group of people or with a recording
:
•
Everyone started to sing along when the chorus began.
•
The crowd loved the song and began to sing along.
to sing a song with a group of people or with a recording