Rose, for your own peace of mind, believe me that it is not your OBLIGATION. You are giving people a good service and no more.I am hoping that maybe Max can make you a reasonable offer and I am also trying to join those looking for alternative sites that lie in the cheap/free range and match your requirements but so far, I have drawn a blank.
Maybe some subscription scheme could prove the only way. I don't know - folk music (I'd better say rather than country as its not a strong interest of mine - more I recognise what you are doing) has always been my thing and I believe in making music free for all (not that I begrudge anyone making a living out of it) but sometimes sheer practicalities make that impossible. Personally, I'd rather look into banner ads before subscription though.
Jon