I can not find a datasheet for the music IC.
I think there is to much voltage drop across the SCR for the music IC to work.
Does the music IC function when connected directly to the battery?
Look at its datasheet.
You have the pins of the music IC connected backwards.
The transistor needs to have a series base resistor as shown in the datasheet.
The IC needs to have a supply bypass capacitor as shown in the datasheet.