Lars Ulrich is just one of a host of stars who check out the Icelandic band on their US tour...

METALLICA drummer LARS ULRICH has written to Icelandic band SIGUR ROS to thank them for inspiring his work on METALLICA‘s new album, after going to see them at a gig in SAN FRANCISCO.

Ulrich wrote the band a note saying: “Thank you, thank you, thank you! We are in the studio right now struggling to make some sort of album. I’m going to go back after this completely inspired.” Metallica began work on their new album at a secret studio location in San Francisco with producer Bob Rock on April 23. Ulrich described the sessions in his studio diary as more adventurous and experimental, adding that they’d kicked off the recording session with “sick, ugly new fucked-up jams”.

Joining Ulrich in the audience at Sigur Ros‘ gig at San Fransisco Fillmore, part of a brief sold-out US jaunt which began at Coachella Festival, were ‘X-Files’ actress Gillian Anderson, who told the band she wanted to come to the UK to see them support Radiohead at Oxford South Park on July 7, and the Kronos Quartet.

Celebrity guests at their New York Angel Orensanz Center show, which sold out within 10 minutes of going on sale, included David Bowie, Moby and Laurie Anderson.

Sigur Ros, whose album ‘Agaetis Byrjun’ is released in the US tomorrow (May 15), returned to their own studio – a converted swimming pool just outside Reykjavik – to continue work on its long-awaited follow-up.

They are expected to tour Japan later this year, with further US dates expected around October.