Some sites and online resources for using songs and music to teach English. 

Online Karaoke

• Singsnap
• Karaokeplay

Other Music Sites

• Blip.fm - a music social network
• Jamstudio.com Mix and edit your own music
• Lyrics Mode - find lyrics to popular English songs 
• Grammar With Songs - EFL grammar through songs
•  Learn English By Songs. - another EFL music resouce
• Teaching with Songs - ESL music materials from Isabel Perez