Bush - Machinehead
Rob Zombie
Godsmack
Prodigy
Rage

On occasion (heavy traffic) DMX

how about primus n.i.b.  as im a wantabe bass player.   and les does it right.  see ya.

I haven't seen any punk posted yet so here's mine:

Rancid, BOUNCING SOULS, Pennywise, and Dropkick Murphys...don't forget Reel Big Fish too

I find it interesting no one has made any more than a passing nod to rap Thats all I seem to hear people blasting nowadays.

Best underrated haeavy band ever and great for riding is C.O.C. that is corrosion of conformity.  

Great heavy songs.. Also Down, which is a side project between the guys in the band Pantera and C.O.C. I"m stuck in the car right now, but it makes me go out and ride all the time.

There's also a guy named Brant Bjork who used to be the drummer for bands like Kyuss and Fu Manchu and his stuff is really laid back and super groovy.

I still have to give my all time votes to the band Nebula
A few examples worth looking for online.
Sonic Titan
Elevation
Rollin' my way to Freedom.
You mean Nothing.

If you can find em' check them out, great tunes.

Jake

Swervedriver are the BEST riding sound imho. They based the sound on cruising.

Agnostic Front for the city rides.

Archers of Loaf for the long haul.

Elastica or a Flyers game for wrenching. Keeps me motivated  

Yeah man, I don't give a flying F about popular opinion. AC/DC will forever be in my top 5 sounds. Thank you Jet for giving a fresh sound to an ole pony.

At the risk of being lynched.... Hayseed Dixie

Great cover band of AC/DC but in bluegrass. Good stuff and I guess AC/DC themselves have taken a shine to them.

Hayseed Dixie's own description of themselves and how it all got started.

Other riding tunes:
White Stripes
Operation Ivy
System of a Down
Wagner - Ride of the Valkyries
Cake
Sex Pistols
Arlo Guthrie (long rides ONLY)

Get some Twista or Linkin Park, or POD.