The most successful folk-rock duo of the 1960s, Paul Simon and Art Garfunkel crafted a series of memorable hit albums and singles featuring their choirboy harmonies, ringing acoustic and electric guitars, and Simon's acute, finely wrought songwriting. The pair always inhabited the more polished end of the folk-rock spectrum and was sometimes criticized for a certain collegiate sterility. Many also feel that Simon, as both a singer and songwriter, didn't truly blossom until he began his own hugely successful solo career in the 1970s.