Villa-Lobos Museum

[Rio de Janeiro] Dedicated to Heitor Villa-Lobos: museum displays and activities; MIDI samples; many categorized links.
http://www.museuvillalobos.org.br/index0.htm

Janácek Archive and Museum

Brno, Czech Republic archive and branch of the Moravian Museum which focuses on the life and work of Leos Janácek.
http://www.sun.rhbnc.ac.uk/Music/Janacek/

Beethoven Memorial Museum

Floridsdorf, Vienna, Austria: The former home of countess Erdödy, where some of Beethoven's works were composed; now houses a museum and small concert hall.
http://members.chello.at/h.swietly/Frames/Deutsch/Beethoven-Gedenkst%e4tte/

York Gate Collections at the Royal Academy of Music

Displays historical instruments, manuscripts and items from the working collections of famous musicians: includes catalog, calendar of exhibits.
http://www.ram.ac.uk/museum/

Enrico Caruso Museum of America

Brooklyn, New York, open only by appointment: includes contact information and gift shop.
http://www.enricocarusomuseum.com

The Grainger Museum

Music, instruments, manuscripts, artworks, textiles and costumes related to the life and contemporaries of Percy Aldridge Grainger (1882-1961).
http://www.lib.unimelb.edu.au/collections/grainger/

American Classical Music Hall of Fame and Museum

Cincinnati, OH museum and hall of fame honoring all aspects of classical music.
http://www.americanclassicalmusic.org/

Ferenc Listz Memorial Museum

Well-illustrated reconstruction of his last Budapest flat, where he lived from 1881-1886, with biographical information, virtual tour, and information from the Liszt Research Centre.
http://www.lisztmuseum.hu/