Sigur Ros 092613

Sigur Ros performed on "The Tonight Show With Jay Leno" in May, provided music for "The Simpsons" and appeared at the 2013 Sasquatch! Festival in Washington state.

BIRMINGHAM, Alabama -- An experimental rock band from Iceland? Looks like Birmingham concertgoers need an extra nudge to buy tickets.

Promoter Red Mountain Entertainment has announced a "buy one, get one free" offer for

. (That's the

, curtained off to create a venue seating 7,500 people.)

Tickets originally were priced at $45-$51.10 each, with general admission on the floor and seating in the lower and upper levels of the venue. Now,

, priced at $58.10.

Ticketmaster also lists a $24.25 price level for the 8 p.m. concert ($48.50 for two tickets) presumably in the upper-level sections. However, it couldn't be accessed today through the "choose seats for me" option on the website.

Sigur Ros (pronounced "See-Uhrr Rose") released a new record, "Kveikur," on June 18 and launched a fall tour of 20 cities in the United States. The Oct. 4 show will mark the band's first appearance in Birmingham.

-- known for its dreamy, ambient soundscapes and clever twists on classical instrumentation-- is led by singer-guitarist Jonsi Birgisson. His falsetto vocals are part of the signature sound, along with the use of a cello bow on electric guitar. The new record, "Kveikur," packs a harder, darker punch, with more dissonant instrumentation and nods to heavy metal.