Ricci Adams first envisioned Musictheory.net during his senior year of high school. Soon afterwards, he created his first lesson: The Staff, Clefs, and Ledger Lines. The Interval Ear Trainer was developed a few weeks later and the site officially launched on January 1, 2000. Since that date, he has authored over thirty new lessons and several new trainers. 

There may be a need, I'm told, to prepare/provide some introductory material to smooth over the differences in UK and US nomenclature.

Find out more at http://www.musictheory.net/index.html.