I have a 10 year old who wants to follow in his brother's footsteps and someday play in the high school jazz band. His instrument of choice, of course, is the string bass. He wants to start now which is fine with me, but I'm concerned that the instrument is just too darn big for him. He's almost 5 feet tall and is bigger than most 4th graders. Is that big enough? Do they make smaller basses that he could handle? We're headed to the music store this week but I would like to hear some opinions from people who don't have a vested interest in renting or selling me an instrument.