Again, you forgot to say which transistors you used and why you used two transistors.
Your LEDs are shown in series, not in parallel. LEDs in parallel do not work properly and the resistor wastes a lot of power because most of the battery voltage is across the resistor instead of across the LEDs.
Your cable appears to be for stereo but the transistors detect the difference between the stereo channels so will have no bass frequencies. Instead the input to a transistor must be through two current-limiting resistors so they add and the transistor turns on with bass frequencies.
You need to add an amplifying stage if you want more sensitivity.