Yes, regularly, if I think I can be of help. For example, not so long ago I was in my local B&N looking at opera CDs (yes, I'm an opera fan) when I overheard a father talking with his daughter (who appeared to be about 6 years old). The daughter had heard on the radio a song called Papageno, or at least remembered the word from the song, and wanted a CD with it on it. The man was perplexed.
I interrupted and said the song was from the Mozart opera, The Magic Flute. I then asked whether he wanted the whole opera for his daughter, excerpts, or a mix of opera that included the song. I took him around and explained the various choices, why some were better than others, and in the end he bought her both the complete opera and a CD of mixed opera that included the song. I suspect that if I hadn't interjected the girl would have ended up with nothing only because neither of them (nor the store clerks) had a clue about the song or its origins.
It's a good thing to help others when you can.
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