He probably wouldn't have the instrument unless he was holding something else. Say a guitar, which I guess is where you're getting at: if chuck maybe had a broom or a pillow (something relatively large), he could transform it too but it wouldn't make noises and stuff. And as soon as he would let go, it would turn back.
also, it would have the texture of a pillow, so your character would feel sick as he would see a hard, wooden/plastic object but feel a soft, cushiony one. do you know what i mean?
EDIT: @feign: sure. I'm pretty sure we haven't left yet. PRETTY SURE. be wary of the beating wings and such.
EDIT2: @pl4y3r, as apposed to getting the feeling of good intentions, touching kylie would make you good, not getting a nagging sensation. It's like a sudden change in personality as apposed to hearing a voice.