on rightclick with music disc:
  wait 100 ticks
  drop cobblestone or sandstone or oak planks or oak wood or stone
on leftclick with music disc:
  open chest with 3 rows named "&7Shop" to player
  format slot 0 of player with chest named "&7Clicker &2Lvl 2" to close then run [make console execute command "/give %player% music disc"]