Penny,
There is NO listing of Song Sharks that I know of but there are warning signs to look out for.
The song shark's most familiar bait is a small ad along these lines: "Send us your poems for expert criticism. You may have a song hit. Upon acceptance, we edit, publish, record your song and bring it to the attention of bands and broadcasting studios."
When the sucker has swallowed the bait by submitting his song, he gets an enthusiastic letter stating that his lyrics are indeed hit material, that with a good tune and publication they can scarcely fail to score. Expenses incidental to publication—tunewriting, arranging, etc.—will, of course, cost a small amount, which must be sent in advance. The sucker sends the money, and is gratified to receive 20 printed copies of his song. He next hears from an apparently different concern (the same shark using a different address), expressing great interest in his published song and suggesting that all it needs is a recording, by an unfamiliar but impressively named orchestra. This can be done for a small fee, and so on.
By the time the sucker has spent up to a hundred dollars, he usually gets tired and quits. For his money he has received a tune any hack composer could turn out for $5, a printing job worth $7.50, a cheap $1 acetate recording.
Song sharks are hard to catch. Most modern sharks are carefully surrounded by expert legal talent. But they are easy to detect. What gives them away is asking for fees. No legitimate U.S. song publisher ever accepts money for publishing a song.
If you see an ad anywhere promising to turn your Lyrics/Poems into Songs, Be very wary and check with the BBB if possible (They probably won't show up as they reinvent themselves with new names every few years if not more often). If you send them a poem and they start asking for fees for publishing, printing, or recording, (no matter how much praise they throw at you about how good it is) you can be pretty sure they probably are a SCAM, and that it's time for you to run not walk away.
Hope this helps.
JRH
For legitimate Songwriter services, Writer's Digest puts out a Songwriter's Market, similar to their Writer's, Artist's, and Poet's Markets each Fall, with lists of Publishers, Recording Studios, Contests, Publications/Resources, Agents etc., and which can be found in most bookstores or libraries or at:
http://www.amazon.com/dp/1582974314/?tag=absolutewritedm-20