Mercury Rev will start work on their next LP straight after their Carling Festival appearances.
The US band are coming to the UK to appear at the Reading and Leeds festivals on August 23-25.
They released their previous album All Is Dream in August last year.
Drummer Jeff Mercel told the Chart Attack website: "In the next few weeks we'll formally sit and then we'll go from there.
"And then six months into the record a lot of things start coming out of nowhere that you had no idea were even in you - song ideas, melody ideas, that seem to come from very strange places.
"And usually, that's the best of the stuff, when you've been really working together for a couple of months. It's a different machine and it takes a little while to get it running correctly."
He says the band's songwriting process sometimes appears long-winded, but new material is always being produced.
He added: "It seems like a lot longer in between records to the outsider than it does to us. People are like 'It's been three years between Deserters Songs and All Is Dream' and we're like 'Really? It seems like six weeks!'
"So it's very different for you and it is a long process. We question a lot and we have a lot of sleepless nights. We sit around a lot at home or in local bars mulling over ideas on a daily basis.
"We're all kind of getting there, we know that the tour is coming to an end, but we know that the record is looming around the corner, so that's a very good thing for us."