Here’s a fun quote from Rob Glaser from the November 2003 New York Times Magazine feature on the iPod:
But while you can run iTunes on Windows and hook it up to an iPod, that iPod does not play songs in the formats used by any other seller of digital music, like Napster or Rhapsody. Nor will music bought through Apple’s store play on any rival device. (The iPod does, of course, work easily with the MP3 format that’s common on free file-swapping services, like KaZaA, that the music industry wants to shut down but that are still much more popular than anything requiring money.) This means Apple is, again, competing against a huge number of players across multiple business segments, who by and large will support one another’s products and services. In light of this, says one of those competitors, Rob Glaser, founder and C.E.O. of RealNetworks, “It’s absolutely clear now why five years from now, Apple will have 3 to 5 percent of the player market.”
I suppose a lot can happen between now and November.