So I went through everything posted in this thread and tapped out the tempo of each song used, and here's the bottom 5 BPMs of the thread:
#1: Sage Elsessers Blessed part, When There Is No Sun by Sun Ra - 51 BPM
#2: Ryan Sublette in Worship Friendship, And Heaven Turned To Her Weeping by Jon Maus - 60 BPM
#3: That bit in Stay Awaysted set to The Pink Room by Angelo Badalamenti - 70 BPM (if we're gonna be strict about it that's not a separate part though, but we've got a shared fifth place anyway so it's still a bottom five if you want to scratch this one)
#4: Tom Penny & Arto Saari in Sorry, Venus in Furs by The Velvet Underground - 73 BPM
#5: Heath Kirchart in Sight Unseen, Knights in White Satin by The Moody Blues - 80 BPM
#5: Montage in Bag of Suck, Sunday Kind of Love by Etta James - also 80 BPM
I mean, some could be higher BPM and just in half time or something, I'm not that good at knowing what's what I just tapped to the song using a BPM counter.