A long time ago I saw a bluegrass band called "Three on a String", who effectively used a TRUMPET in some of their tunes. Called it the "Bluegrass Threevalve" or something. I found it unusual, but pleasing. My current favorite combination is bass and flute, plus either 12 string, mandolin or autoharp. This is mainly since my daughter, Annie, picked up the flute about a year ago, and really has a flair for it. She studied it in school years ago, but now relies on playing by ear, and does it verry well, whether folk, blues or jazz! It really sounds nice. Plus, another friend has the unusual ability of pulling the mouthpiece off of said flute, blow into it like a trumpet, and make it sound much like a clarinet! We have a lot of fun.