episode with cheesy piano musician

"Silence My Companion, Death My Destination"

from what I remember of this episode, Iron Man is trapped somewhere with someone's daughter, and at some point, his armor is damaged and runs out of energy-- incredibly, to recharge it, he ends up using the kid's Walkman ("sonic energy"), to re-power up..

throughout the episode, there are references and apparently a cameo by some Muzak-style piano musician.. was it Marvin Hamlisch? if not, who?

"With Great Power Comes Great Responsibility"
Stan Lee, 1962