Based off of this statement you're giving me the impression that you are questioning paid music streaming in general and not the potential integration of micro payments backed by the LN (?).
No, I am not.
Good for them.
You also have to take in consideration that not all songs are available on YouTube (or not in the same audio quality).
I doubt that. The songs get uploaded to the official channels, so sound quality isn't the issue. Plus I haven't been in a scenario where I would have searched for a song and a youtube result didn't pop up. Plus there are services like Soundcloud.
A pay-per-minute model could prove to be a lot more cost effective for users who don't use the service that frequently. Instead of paying the full subscription fee every month they could only pay for the time listened per month.
You missed my point. $5 a month or $10 in the case of premium aren't much. People would still prefer a sort of subscription at this point range. LN could be used here to eliminate the fees which would have been incurred on the credit cards. I mean this sort of pay-per-minute model makes sense in developing countries where they live off on $2-$3 per day. But if you are targetting that sort of an audience you won't be getting anything out of it. I would love to see these subscriptions on the LN, Eliminating all sorts of fees for the buyer and the seller sounds good to me.