This is a practice track for bass players, wanting to practice up their chops in C major with a basic rock feel. The chords are A minor and E minor:-
||:Am | |Em | :||
Use your C major scale to create runs between each chord. You can also use your arpeggio notes for each chord to create interesting lines. You might also like to experiment with using your A minor pentatonic runs on the A minor chord, and E minor Pentatonic runs on the E minor chord.
Jam away, and have some fun!