This is a practice track for beginning and intermediate bassists. It is a simple slow rock rhythm track, with drums and two rhythm guitars. The chords are D minor and G:
||: Dm | |G | : ||
Start by using the root notes of each chord, and play on beat one of each bar. See if you can add to the groove with where you put your notes – listen in particular to the bass drum, and see if you can synchronize with it.
When you are comfortable with this, add the fifths of each chord (A for the D minor, and D for the G).
Then see if you can incorporate the thirds of each chord ( F for D minor and B for G).
For walking bass lines and riffs, experiment with the D minor pentatonic scale, and the Dorian mode of the C major scale.
Enjoy!