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Sound-reactive lights! Help!

i want to take a 4 sets of Christmas lights and make them react to music, how would i do this?

i want something like this but with Hi-Power AC 120V

i have a couple complimentary high power transistors laying around,
how would i go about building it?

110100101108 years ago
use optoelectric isolator and something like BT138 on the ac side