I took it upon myself to do a bit of research; and what a motherlode of....riches I found!

http://eilertpilarm.to/ (this is Swedish, but worth a look!)

http://www.algonet.se/~pergunne/ljud.html (HEAR the SOUNDS!)

http://www.algonet.se/~pergunne/eilert.html (Everyrthing you wanted....and more, including how to buy Eilert's CDs!!!)

I know what everyone on MY list is getting next Christmas---Eilert's Jul!!! Pass the aquavit, STAT.