Ill post a quick guide, because my trophy glitched. You can do this on a combination of instruments, you need to 5* all the disc songs 65 i think. you can ignore the 5* hard trophy as this one will pop both. mine totally glitched, i was gutted but decided to continue with the 30 gold star trophy. after a few songs i fc still into you and voila, the silver hard and gold trophy popped randomly! happy Holly :) feel free to add me on psn if you play rockband.