Advice for bassline for progression...please!

you should try to get a recording of you playing this so we can have an idea of what you're really working with.

 

Then can you write out the rhythm of the progression for us?

 

one thing to consider - sometimes a chord progression sounds wonky on its own, but as soon as you add the melody it all makes perfect sense.

 

Ask the songwriter. If the songwriter doesn't know/doesn't care, then play the roots and get paid.

Above all else, listen to the vocal melody and do not play notes that clash.

 

Exactly-- and there's no way that I could suggest a bassline without hearing the melody.
I could suggest things like inversions (playing notes that are not the root of the chord) and pedal points (finding a note that's common to several chords and staying on it while the chords change over it)... but it's all abstract without hearing the song itself. Playing the roots (and only the roots) of each chord might be superb.

Taste is everything!

 

Hard to say without hearing the song, but here's something you might try:

Chorus: C-B-A-G-F-G-C

Verse: C-B-A-E-F-G-C

It's a nice pattern and should work depending on what the guitar and melody are doing.

 

I'm guessing each chord lasts about two beats?

I think there's an opportunity for a semi-walking line. Starting with C, then up 3rd and 4th drop to G then 5th and down to F, etc.

Since the two lines are so similar, I might start both at C but head in different directions depending on verse or chorus, or maybe just hit the higher G's and F's during the 2nd and 4th iterations of one or the other.

I may overly complicate things, but with two simple and similar parts I like to create a little distinction to make them seem a little different. With short resolves (assuming 4 bar for the guitar), I would try to find a 16 bar pattern that makes things interesting.

Just my 2 cents given the amount of info there is to go on.