@YouTube it would be cool if as a viewer you had the opportunity to Chose only to hear the Audio on Music Videos. Because with Mobile Internet, Videos cost to much MB.
Thanks for reaching out. YouTube Music Premium is a paid membership that will get you an audio-only option, background listening, downloads, and an ad-free experience. This is on top of all the regular features! Here's more info: https://goo.gl/GWoVhQ