>>/6543/
> Hay that's like, the mirror to L-Train's cover image for 'daybreaker
yeah, I saw an EQD article about a song that used this picture even though I normally scroll pretty fast the site when it comes to these articles and move onto something else. You know about the fan music scene much better than me 

> Did somepony make a song about NMM claiming to be the better version of 'baby Sister, here'?
as far as I can tell, no. Considering that the image was drawn not long ago, chances are pretty slim for a musician and use it as a cover image for any project. Perhaps in a few months (or even less), that could happen.