Cobain’s D-18E became the most expensive guitar ever sold at auction ... Renowned music journalist and Guitar World contributor Alan Di Perna has been tasked with curating the exhibition ...

Guitars are expensive, but these three take that notion to a whole other level, as they sold for well over $1 million.

More from So Expensive Editor's Note ... Martin acoustic guitars are some of the most popular and well-known high-end acoustic guitars in the world. They're owned and played by pop stars like ...