Hi folks. I've recently joined a blues band and hence trying to learn as such as I can about blues bass. I do listen to a lot of RnB and blues and have rad Ed Fried,ands book cover to cover. Now here's my question which may sound stupid but here goes. The blues scale is sometimes shown as 1 3b 4 5b 5 7b and sometimes the 3 is included as well....so I suppose they are interchangeable. My question is, when jamming along to a routine 12 bar (eg highway 49, sweet home Chicago), is it ok to use the 3rd or flatted third freely? When does one sound better than another'? To my cloth ears, in some blues standards the flatted 3rd doesn't quite sound right. I'm trying to invent interesting blues baselines but I often seem to end up in Ed Friddlands ' boogie ' which seems to go well with many blues numbers. That uses the 3rd, not the flatted third and often when I try to include the flatted third it sounds a bit odd. As I said, I've got cloth ears which probably don't help. As you can probably tell I m not too hot on theory....I'm just trying to come up with some basic shapes on the fretboard that will work with any blues song. Thanks in advance!