This is the basis for the gestural-based music player. Here is a list of the inspiration and gestures for the device.
Gestural interface:
Gestures: Pointing to start, swipe left for last track, right for next track, ASL letter B with a relaxed thumb for stop/pause, raise open palms for increased volume and lower for decreased volume, clap for mute, vertical pointed finger rotating for shuffle.

Original Set of Conventions:

It is loosely based on ASL, with a high context for the majority of gestures. The motion for pause is the same one a crossing guard would use to stop traffic and/or children.

Pause

Just like reading a book, high context, going back is by swiping to the page to the left.

Song Selection: Left Back, Right Next

Musically, a conductor would raise and lower their hands to provide dynamics in an orchestral piece. Similarly, the motions for volume control would raise and lower, depending on the desired volume.

Volume Control

A quick clap to mute is designed after school teachers using clapping to quiet the classroom.

Pause

Shuffling is based on a finger motion designed to emulate a blender; i.e. shuffling. This one would be considered low context, due to the nature of the gesture. Considering not everyone has access to a blender, while representative, it is more cultural than big picture. http://https://www.thoughtco.com/thmb/81-Xe9qgEUHFwLMmeT1IX_1GJMg=/768×0/filters:no_upscale():max_bytes(150000):strip_icc()/skyward-56a9e25b5f9b58b7d0ffab68.jpg