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That somewhere along the line, someone who was not familiar with music gave his OK to something that directly concerned music.
My guess is that nobody in the process was truly familiar with such specific music. Considering all the varied topics covered by stamps, it would be nearly impossible and quite cost prohibitive to make sure everything is perfect. Stamp production is usually more concerned about the artistic quality of the stamp and the production quality/specifications. Factual accuracy gets a "good faith effort" but when you have to mesh it in with "artistic license", things get blurred quite easily. That's why, most of the time, these design errors are noticed AFTER the production and distribution, where they are noticed by someone in the general public (much wider pool of people, some who are sure to be actual experts in a particular field).
Ironically, things have actually gotten much better, because most postal agencies will release stamp designs publicly BEFORE the actual printing, so design errors do tend to be noticed/reported beforehand. Unfortunately for the Legends of the West issue and Grand Canyon stamp, nobody reported it until after the stamps were printed.
The other thing to note is that governments nowadays tend to be a little more sensitive to design errors because it's a lot easier for a small group of people to create quite a stir. In the not so distant past, many complaints about design errors could be expected to be shrugged off, unless it was something that would irritate a core group, such as with the Schumann stamp. A good example is the PRC stamp inscribed "all of China in red" (in Chinese of course), but where the designer left Taiwan not colored in red! Trust me, you did not want to be associated with the team to produced that issue! Not sure what happened to the designer. But the stamp is worth a bundle today.