AJGR wrote:learn a scale is.
now make a tune only using the notes in the scale.
you really can't go wrong, it's easy once you know how.
+1
i completely agree. i've been playing bass for about 8 or 9 years now, and something i learned very quickly is that all you need to learn is what the basic "formula" of a type of scale is.
i'll try and explain this simply, cause it works well in my head: in music, a half step is a single note above or below the note you're playing and a full step is just double that. therefor, an A flat is a half step below an A. now, when playing the most basic scale of them all imo, a major scale, you start with your root chord (let's say A), go up a full step to the 2nd note, (B), another full step to the 3rd note (C sharp), then a half step to the 4th (D), full step to the 5th (E), full step to the 6th (F sharp), a full step to the 7th (A flat), and a half step to the 8th, which is the octave above your root (A).
if you write all those notes into your sequencer piled on top of each other, you can see the "formula" for a major scale. you could literally just transpose that up and down and get whatever major scale you wanted. same goes for all the others (to my knowledge, someone PLEASE call me out if they have counter facts!)
now play a shit simple bassline, maybe just some rhythmic kinda deal on the root chord, and play around with the 8th, fifth, third, and stuff until you get something nice.