I just wanted to answer my own question incase anyone needed to know the answer...there are two trailers for friends...one where they say "your friends for life...etc" that commerical plays "Let my love open the door" by Pete Townshed...this song can be found in his greatest of album or the Mr.Deeds soundtrack. The other trailer including all nbc shows has "come along" by titiyo playing. I know there is yet a third trailer of friends but i am not sure about that one.