When you spam click on a noteblock (with a macro, or an autoclicker) whilst holding a disk; 

The music will play regardless if the disk will be ejected.

The more you spam click, the more duplicated the music becomes. So it'll play 3 songs at the same time.

When spam clicking with a disk, and using another one on the same note block, the music will play over each other, so you'll be playing multiple disks at once.

So far I only tried it with C418 - Cat ; C418 - 13 ; Lena Raine - otherside

Please update me if it works with other disks as well.