The year is 1969. Apollo 11 is set for launch. Man is about to take off for the moon. NASA scientists on the ground have gone into overdrive. Neil Armstrong, Buzz Aldrin and Michael Collins are sitting in the command module. But when the spaceflight takes off and they put some music on to while the light-years away, the songs that they hear are from 20 years later. The astronauts are listening to a straight-up grunge playlist. It's a genre that emerged in the late '80s. But in this scenario that we are talking about, time is just a concept with no meaning at all.

That is the sort of outlandish theme that runs through Armstrong's List, a concept album that city-based act Gumbal will launch at a gig next week. It's a seven-track offering that is an imagined version of what the crew members of Apollo 11 would be listening to on their journey into outer space. Rock and roll, at that point in time, was a genre that was enjoying its moment under the sun. Grunge, its subset, was still a product of the future. But in the minds of Gumbal members Arjun Iyer and Satish Sridhar, that latter sound is what comprised the entertainment on Apollo 11 when it travelled all the way to the lunar surface.