Go With the Flow is a ballad at the easy level.  It can feature any instrument on the solo part, which is just a bit more advanced than the band parts.

The piano part is very prominent, but is mostly based on one recurring figure which is easy to learn. The bass part uses a very easy range of notes.

The band parts are easy, and most of the writing is just two parts, so the piece will work well for bands with incomplete instrumentation.