With People SING IN A BAND it helps the PUBS and CLUBS & BANDS as it gets more people in there.
The BAND will PLAY their music and let you sing.
We hope your friends will dance with your song.
Also you can SING "HAPPY BIRTHDAY" to your friend.
The BANDS will advertise how many songs are available. 
They will list a MUSIC STYLES and SONGS - They also may show you lyrics.