My 9 year old son has played piano for about a year and is interested is playing bass also. He has a short scale, violin bass that fits him pretty well and a comfortable practice spot. His sister (12) plays drums and his best buddy has started guitar lessons. I have played bass for a few years, but have not had lessons, so I'm not sure how to get him started. We want to keep his piano lessons going, while slipping in a bass lesson (with me as instructor), once a week or so. Is this a realistic idea? Any suggestions on a lesson plan? Practice time?