I’m looking for play along tracks that would have simple 1,4and 5 chord changes. Any suggestions?

New to this site and apologize is this subject is a repeat. Im new to the tuba world coming from the fiddle. I have a York e flat sousaphone that I thought I loved until I got to try a conn e flat sousaphone. It felt so great to feel the tone and wonder if it is a better instrument or should I have ...