That's more music than I probably have heard!  Lessee -- 13,000 times 3.5 minutes per --- 45,500 mins of songs -- 758.33 hours.  Ok, so I have heard that much -- but thats almost 100 days listening 8 hours per day.  Who could ever keep track of all that?  (Now, as a backup storage device -- that makes sense.)

Sony Debuts 20 Gigabyte Walkman to Silence IPod (Reuters). Reuters - Sony Corp. unveiled plans on Thursday to launch a Walkman digital music player capable of storing 13,000 songs, aiming to reclaim the top spot in a market now dominated by Apple Computer Inc.'s iPod. [Yahoo! News - Technology]