“Soccer (Summer 1988)” is a classic end-of-summer song— a tale of nostalgia for Rwanda’s favorite soccer team, Rayon Sports F.C., in the more innocent days before the 1994 genocide which claimed some of the team’s players and countless fans. It is a first-take without overdubs, recorded in bandleader Adrien Kazigira’s barn. At this particular meeting, Adrien and co-lead singer Janvier Havugimana played each song together for the first time. Yet, with only a minute or two discussion beforehand, they fell in so seamlessly that these virgin ventures were indistinguishable in ease from the stalwart songs they’d played for decades. Such it is with two gifted men that have harmonizing together since childhood.