We really need more context don't we?
I've known some teenagers play music over their headphones 8-10hours a day ... but usually at background levels (for them) and they are also carrying on their regular tasks, and it's not just the same song over and over. There are to many variables to be precise about the effects... but there will be an effect.
Examples - listening to music and learning/memorizing.
"Mozart effect" in boys with learning disorders.
http://pom.sagepub.com/content/27/2/138.short
More to the point:
Psychology today reports:
http://www.psychologytoday.com/blog/memory-medic/201007/music-training-helps-learning-memory
... though it's more about deliberately developing cognitive skills.
What about listening to music? Same magazine:
http://www.psychologytoday.com/blog/memory-medic/201312/does-music-help-memory
citing: Gold, B. P. et al. (2013) Pleasurable music affects reinforcement learning according to the listener. Frontiers in Psychology. Vol. 4 Article 541. Doi: 10.3389/fpsyg.2013.00541
... almost the kind of thing suggested, but only short term.
I would not expect that commercial products and/or any YouTube mixes would do any better than just listening to music you like.
In terms of torture regimes, it is amazing what subjects remember after 10 days of nothing but Barney
I love you ...