Originally posted by stephanie
Great thread!
So I've been looking back at some past jazz-related threads and reading some articles. I'm trying to improve my basslines. While trying to write a line for "My Funny Valentine" I've realized I've hit some kind of standstill or something. I've listened to a few versions of this song (minus bass) and still can't figure out the feel to it. The line I wrote isn't very good. Should it be a regular walking line? What? I just wrote a bassline for "All of Me" and I'm pleased with it..and I've never heard this song before in my life. I just had to rely on the melody.
I think my question is How can one improve writing jazz basslines? Is there some secret behind all this? How do you know what kind of jazz line you are writing when you barely know the song you are writing the line to (even after looking at the melody)?
Thanks 
Stephanie
Well, as far as knowing what to play, how is the tune being played?
Bossa Nova, Latin, Swing, Funk, Ballad, Bebop, Jazz Waltz???
Then you've got tempo.
Fast, Med, Slow???
So, you could play My Funny Valentine as a Med. Funk, or a Fast Bebop, or a Med. Swing. Each style of jazz is going to have it's own rhythmic variations. Swing is often characterized by "swung 8ths notes," while bossas have a very distinct 1-5 feel, (which my teacher refers to as "The Business Man's Two-Step).
It's not a bad idea to take a tune like "My Funny Valentine" and play it as a bossa, as a swing, as a ballad.
Generally speaking, the style for the tune is agreed upon on the stage, and may be as brief as the band leader telling you how to play it, or something mutually agreed upon at a previous rehearsal, or something of that nature.