Yahoo! News StoryAlthough it represents only about 3.5 percent of total U.S. compact disc album sales, jazz is the only type of music to have posted gains in each of the last three years, and in four of the last five, according to research firm Nielsen SoundScan.
Perhaps the artists mentioned aren't what we prefer to call "Jazz" but it's good news nonetheless.
I also found this interesting:
Jazz listeners also offer music companies hope because they are the most likely group to pay for what they find online. Jazz sales account for about 2 percent of all the music sold worldwide, but represent about 10 percent of legal downloads, industry executives said.