Two discs playing at the same time on one jukebox.

I was playing some music discs in my superflat world, and then came up with this issue.

How to do it:

1. Kill a creeper with a skeleton to get a music disc or get 9 fragments on an ancient city, or type this command 

give @p music_disc_<13|cat|blocks|chirp|far|mall|mellohi|stal|strad|ward|11|wait|otherside|5|pigstep> 

2. Spam the key use or right click.

3. Done.

To see the video please click this link