Feel like your vote doesn’t make a difference? What if you had 30? From now until Sunday morning (9/8 c), fans of the Arlington, Texas a capella group Pentatonix can vote ten times each of three ways before Monday’s live finale of The Sing-Off:

• online at http://www.nbc.com/sing-off/vote
• by phone at 1-877-6-SING-01
• and text 1 to 97979

(standard rates and fees may apply)

[youtube]http://www.youtube.com/watch?v=l_VCF-9IrOE[/youtube]