That might work, but doing something like turning the headlights on, etc. would blow the fuse also. Interrupting the power to the starter and the main fuse block and powering the "keep alive" circuit to the sound system with about a 5 amp fuse wired straight to the battery would be a more logical approach, IMHO.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!