Dave Zerkel did the Serenade #12 on his album, which you might be able to get from him or through Tap music (under the shops section). I don't know the Sear sonata, his method book is really good as are his duets (FWIW). What is the Sonata like?
Bill
I know Harvey recorded the Serenade on one of his (vinyl) albums. The album had no title. It just listed the works, composers and performers in white, red and black artwork. As they are releasing his albums on cd, you might want to check to see if that one is available yet.
I have Dave Zerkel's CD in stock (that includes the Persichetti) for $10 plus $1.50 postage and shipping. Feel free to email me privately. Steve Shoop-- stephen_shoop@yahoo.com