Watch the Ivory Place online guitar lesson by Andrew Ford from 30 Rock Bass Grooves for Beginners You MUST Know
This groove is in the style of "White Room" by Cream. It's another cool rocker that is mostly quarter note based with some eighth note rhythms mixed in. The first bar has the D chord pounded with those two quarter notes. Then, we have a slight variation with two eighths and a quarter on the root, C, for beats 3 and 4. The next bar is all quarter note roots on B for 2 beats and then on Bb and C, which we'll play with a little less length than a normal quarter, indicated by the dots on top of the notes. They're meant to sound more like eighth notes.
In Bar 3, we stay with the quarter note theme on the root D for two beats and then play this melodic rhythm over the F chord that consists of the root F, down to E, the major7, back to F, and ending on F# which transitions to the G chord in Bar 4. In our last bar, we start with the root G played on the D string, going down to the octave G to A using a couple of eighth notes then ending with a couple more staccato quarter notes on beats 3 and 4.