We're 30 years into a cartridge design revolution, particularly at the top end of the market, where manufacturers charge upward of $10,000 for their best efforts: prices that well-off consumers have amply proved they are willing to pay. There doesn't seem to be an innovation end in sight.

An outburst of saxophone flurries sits you straight up in your chair. The tone is rich but with a cutting edge.

It has to be Rudresh Mahanthappa. The riveting cry of his alto saxophone is one of the most recognizable sounds in jazz.

But those darting runs coalesce into Charlie Parker's "Red Cross." So it can't be Mahanthappa, can it? He has made 15 straight albums of original music. He doesn't do covers, right?