Amazon.com: Easy Classical Guitar & Alto Recorder Duets: Featuring music of Bach, Mozart, Beethoven, Wagner and others. For Classical Guitar and Alto/Treble Recorder.In Standard Notation and Tablature.: 9781466307872: Marcó, Javier: Books
Georg Bolin 8 string alto guitar | Reverb
11-String Asturias Alto Classical Harp Guitar, by Wataru Tsuji, Japan