Who played accordian on the song "Streets of Bakersfield" (Dwight Yoakam version)?

Flaco Jimenez

edit: Flaco is to the accordian what Johnny Gimble is to the fiddle. In other words...They know their SH!T

Flaco Jimenez

Flaco is a well-respected musician among our friends to the south, and he was also a member of the much-celebrated Texas Tornadoes. Honestly, a genius on that accordian.

Flaco as stated.
I just wanted to point out that he is really not well known in Mexico. He was born in Texas, and has been a Tex-NeX/Norteno musician since he was very small. Also worked with Doug Sahm in the 60s.