Note: This is pretty long. If you want to read an overview and a possible reason why I prefer Nordic music read the next section.
When I first came to last.fm as a thirteen year old I only listened to three artists. They were Ladytron, Metric and the Yeah Yeah Yeahs. I really wanted to discover new music. I discovered a lot of new music. One problem I had was that most indie music sounded bland to me. Two artists that stood out to me were both from Sweden. They were The Knife and The Sounds.
I also got into Björk, an artist who I used to think was a bit too weird for me. The person who let me borrow her Björk CD, also introduced me to Metric and the Yeah Yeah Yeahs. That made her recommendation more trustworthy. She also recommended PJ Harvey, Ani DiFranco and Jewel. I haven't really gotten into them. I still have some of their songs on my iTunes.
After I got into Björk and The Knife last.fm started to recommend Nordic music. I felt a bit intimidated because back then Nordic music was foreign and new for me. When I got into Icelandic music I discovered a few artists that actually sang in Icelandic. This was new for me. After I listened to a lot of Icelandic music I got interested in learning the Icelandic language. When I was learning Icelandic I also learned about Icelandic culture in general.