The previews for episode 21 (formerly 20!)

[weareglorious]

http://searchservice.myspace.com/index.cfm?fuseaction=sitesearch.results&type=Music&qry=glee%20world
It's a Man's World = "all girls number" but technically you can hear only hear Quinn and Mercedes wailing! HECK YES. :)

http://searchservice.myspace.com/index.cfm?fuseaction=sitesearch.results&type=Music&qry=glee%20one
Another One Bites the Dust

http://searchservice.myspace.com/index.cfm?fuseaction=sitesearch.results&type=Music&qry=glee%20good
^ Good Vibrations & Tell Me Something Good

If someone could upload to YT, that'd be great because I know some people can't hear the previews on Myspace.