Legendary Brazilian psychedelic rock band Os Mutantes’ concert at the Space Ballroom Tuesday night was a show that almost didn’t happen. At 11 the night before, on a turnpike in New Hampshire, a piece ...

Here’s Os Mutantes’ first new song in more than 30 years. You’d think they’d be out of practice, but apparently crafting brain-melting, psychedelic Tropicália is a lot like riding a bicycle.

Forty years after they first formed, one of Brazil’s most influential music groups reunited to plenty of international fanfare in 2006. At first, however, that reunion came as a surprise to the ...