💝 Does the music on the background always has to have the piano? 💝

Correct.

Can you do it without? No. On Earth might be already eliminated, but if saying eternal life some higher quality, no. You all need every trace of the strict discipline with the music teacher. You never met one dress properly, attire correctly the music teacher? 

Talk, stand, act, posture, looking right at all? The manner?

You mean how those High School musical after 1, its 2 and 3?

You may not learning the very first music theory, there is a sequence how they putting things together, you go by listening, you go by pitch, you go by the rythmn, you go by those 升降記號 meaning you looking a music sheet, your eyes automatically with your both hands :

are in the sequence, "as you read", as shall you play by that 升降記號 by that each interval without too many times rehearsal, if without the teacher, you will go on on your own reading that entire music sheet all by yourself finish that piano piece.

Not by hearing others, and copy and paste. No.

You have to be able to read those notes, and rythm, the beats.