1.You need 6 test tube .
2. You need a marker .
Step 1: Denote Test Tube
2.Denote the test tube and put water in them , alike picture .
Step 2: Music Notes
There are C - B notes ( Do - Re - Me - Fa - Sol - La - Si )
Step 3: Fill Them From Water and Play Music !
Then fill the test tube UP TO marker plane , and play music !!!