Doug Sahm -- Doug Sahm & Band
Doug Sahm & Band is arguably his finest work. The album was produced by Jerry Wexler, and featured some major heavy hitters: Bob Dylan, Dr. John, and David Bromberg....as well as the ever-present accordionist Flaco Jiménez. Groover's Paradise is my personal favorite, and was recorded with members of Credence Clearwater Revival. The album is just plain fun, and makes you feel good about life. Either one of these make for a perfect road trip album.
Doug Sahm & The Tex Mex Trip -- Groover's Paradise
Interesting tid-bit: Sahm got his start at a very young age, releasing his first album at 11. That same year he played on stage with Hank Williams at the Skyline Club in Austin, in what turned out to be Hank's final performance ever