i recently purchased this toolbox for my 16 year old son in the hope that it would help him and his garage band to play in tune. but they are still blasting away every friday evening and sunday afternoon out in the garage, and how they dont know they are soooo out of tune it beyond me! so i guess it didnt work. but at least it cost less than sending him to music camp (i dont really want to encourage him) or to psychotherapy (which i think he really needs).