Courtesy of LL, here is a very talented young lady playing the original version of Taps, known as "Last Post" (aka Il Silenzio). Take the time to listen to it all the way through, it is well worth doing.
Who knows that Bugler Bob in Germany will appreciate this...
UPDATE: I was wrong, and in fact made one of the classic mistakes of intelligence: trusted-source-itis. This is Last Post, but Last Post was not the basis of Taps. Taps is a version of an older call redone during the Civil War under Gen. Butterfield, and as such was also known as "Butterfield's Lullaby" for a time. A good history is here. The young lady is still quite talented, and the rendition quite nice, but is not the basis of Taps.