When you warm up on guitar or bass...

[Phil]

I practice my bass less than I wish I did, but I always like to warm up on Waiting Room's (Fugazi) opening riff.

[klefmop]

Literally the first thing I play when I pick up a guitar is Epliogue to a Carcrash

However the first thing I play when I pick up a bass is Schism by tool.

[riderofbrohan]

i like to warm up with the smiths and the cure.

[noisehead]

on bass the beginning of Some Natures Catch No Plagues. or the Peanuts theme.
on guitar, Tigersuit.
i'm insanely cliche.

also on guitar, bound for the floor by local h. whoaaa!

[kyeospeaks]

everyone here is so screamo, they warm up with screamo songs.

[vavavampire]

guitar: 7 angels 7 plagues, the saddest day by converge (minus solo lol) or old cave in

Bass: My bands shit or less than jake because their basslines are fun.

[Bentwreck]

Guilty of Being White by Minor Threat. No reason why, it's just fun to play and all over the neck.

[thisguyisalright]

My warmup song when I was horrible at guitar was Egg Raid On Mojo by the Beastie Boys. Even though it's basically the most simple song you can play it's still really fun.

[Indian Bummer]

for guitar i usually do a pixies song or a weezer song

for bass i usually do lovecats by the cure or gigantic by the pixies