I was doing a search for threads with the word "Spain" in them, and came across this one.
In spite of living not too far from the city of Valencia, I don't currently get much chance to go down there and check out the Jazz scene. May be worth researching.
San Sebastián, in the north, hosts some great festivals, but I don't know what goes on there outside of that.
So, to be on the "safe side", choose the big cities, either Barcelona or Madrid. I had personal experience of the former and hope that things are more or less as they were 10 years ago. Great city, as far as cities go
