One (seen here in 1981) was the lead guitarist in the Grateful Dead, a peacenik American band. The other (seen here in 2015) is the president of Iran, a not-so-peacenik Middle East country. Spookily, the Grateful Dead called their eighth album Blues for Allah. Coincidence?
So here are the Grateful Dead in 1991 as backing band for John Fogerty with his Creedence Clearwater Revival hit “Proud Mary”. Yes, really: