I put all my music selections in an Excel file. Now after many years of dancing, I listen to each CD with my list as I read The New York Times. Now I'm learning the names and the orquestras that I hear at milongas. My overall favorite is Quejas de Bandeneon: Troilo 1958 (This is the version from The Tango Lesson.) I don't like any other version including any other Troilo version. My favorite Di Sarli is El Jaguel. What is you favorite overall or favorite orquestra. You can expand your answer to be favorite tango, vals, and milonga.