Korbin Thessinger

 was a composer. He was visited by Will Alloran and talked about Alleron's sister. He was an old friend of the Seventh Doctor. He tutored Will and Lomas Alloran. He was annoyed that Will went of to war and Lomas stayed. He didn't understand why Lomas wanted to study bioharmonics. He took Hex and Lilian Dillane to the archive, to look for information about Bioharmonics for the Doctor. (AUDIO: Nocturne)