When I add a TON of music from an artist that I don't think is going to appeal to a large part of the listenership, I prefer not to make the extra work for myself of preparing each file to show up on the "New Music Search".
So, for anyone who's interested, I just added George Straits "50 Number Ones" and a greatest hits set from Dolly Parton.
You can find the new music by searching for either artist.