There is a few short alaps played by Ustad Vilayat Khan (London 1968)for the book "The Rags of North Indian Music" by N.A. Jairazbhoy (Wesleyan unyversity Press). Audio files are Mp3's Rag Des (1:48) Rag Marva (1:47) Rag Tilak Kamod (1:45) Rag Yaman (1:34) Rag Darbari (1:50) Rag Sankra (1:50) Rag Suha (1:51) Rag Kedar (1:48)