This is what music between two virtual worlds looks like: on the left, acclaimed Second Life-based musician Grace McDunnough performing for an audience in SL's Isle of Wyrms (including several appreciative dragons), while also performing as a Metaplace avatar named "Grace McDunnough" in the Folk n Coffee Cafe of the web-based user-created world. The cross-world concert began with a request from Metaplace founder Raph Koster; to hear the performance, he explains on his blog, Metaplace users just had to set their audio to the Shoutcast URL where it was streaming. Looks like a great way for SL musicians to expand their reach and audience. Ms. McDunnough has an excellent post on her blog, explaining the rest. "I realized how important it was that I was Grace McDunnough in both places," she notes, so she could maintain a unified performance identity. While there's a lot of conversation about virtual world interoperability of content and currency, this is probably the most poignant application I've seen so far: worlds literally linked by song.