LED to music sync barely blinking even with amplifier
Either the LED circuit is faulty or the audio circuit. To help you hone in on the problem I would suggest the following:

Disconnect the base of the transistor from audio+. Rewire the base pin via a 10kOhm resistor to +9V. If the LED lights, then the problem has something to do with the amplifier. If it doesn't light, then you know something is wrong with the LED driver circuit.