David and Steve Gordon.
:)
Most of the time I don't listen to anything but the road when I ride, but I have put on the earphones and used an MP3 player or my phone to listen to music.
Poison, Ozzy, Charlie Daniels, Allison Krauss, Alice Cooper, Dwight Yoakam, Rob Zombie, Shane McGowan could all be in the running if vocals were a must... Tori Amos... Alanah Myles... Love to hear women sing... Ooooh, Moxy Fruvus... Richard Cheese... Weird Al!!!