The product described is a sheet music titled "Virtuoso Music for Classical Guitar Parkening Plays Bach" by Christopher Parkening, published in 1973 by Antigua Casa Sherry-Brener in the United States. This sheet music is specifically tailored for classical guitar players, focusing on Bach's music in a virtuoso style. With a single unit available, this sheet music is a valuable resource for musicians looking to explore and perform classical guitar pieces with a renowned artist like Parkening as a reference.