No, they know the vocabulary of jazz from their younger days. Almost all youngsters are bewildered by music without backbeat, amplification, vocals, etc., the rare exceptions being youngsters studying music who are exposed to jazz as part of their curriculum and learn to read its complex grammar. However, youngsters don't walk out of places like Starbucks where I sit listening to the musak and thinking That's Cannonball or That's Timmons. Perhaps because it's at low volume it's not recognized as music and is subliminally accepted.