Glass sliders can be used to play many songs but are expressive. Here is a easy way to make one.
Step 1: What You Need
Glass of ice water
Make sure both the pot of boiling water and ice water is big enough for the bottle
Step 2: Cut the Bottle
Create a 90 degree angle using to blocks of wood
Place a bottle in the nook
Use the glass cutter to cut a line around the neck (you may need more then one bottle)
Step 3: Breaking the Glass
Count to 20 then switch to ice water
You may need to switch it in and out several times.
Depending on where the glass pops off you may need thongs.