Piano Is Fun
Learn to read musical notes and play the piano. Junior level.
http://www.pianoisfun.com

Piano ChordZ
[Win] Utility for visually referencing basic, standard, and expanded piano and keyboard chords.
http://www.keynotemusic.com/software.html

Pro Piano Records
Pro Piano offers dozens of piano rental and piano lease plans, with the best service in the business and 800 toll free customer service nationwide
http://propiano.com/

Adventus Incorporated
Adventus, world leader in music education & technology. Learn to play with piano learning software like Piano Suite Premier and Children's Music Journey
http://www.adventus.com/

Mapes Piano String
A family business that manufactures piano strings, spring wire, and specialty wire.
http://www.mapeswire.com/

Lexikon Sonate
Interactive realtime composition running as software on Apple Macintosh computers.
http://www.essl.at/works/Lexikon-Sonate.html

Wilmarc Records, Inc.
Provides piano CDs of solo piano works with or without educational commentary: partial catalog, prices, request form for mail-order catalog.
http://www.wilmarcrecords.com/

Carousel Music
Selection of recordings of authentic old-time automatic music machines including Wurlitzer and European band organs, calliopes, barrel organs, cottage orchestrions, violin piano and piano orchestrions.
http://www.carousels.com/cmusic.htm

ScaleTool
Guitar and Piano Scale and Chord Calculator
http://www.scaletool.com/

Fun Publishing
Learn to play music instantly with no need to know sheet music or notes. If you know your ABC's you can play the piano, recorder, or xylophone. Music books made EASY.
http://www.funpublishing.com/