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. But the best of S&G's work can stand among Simon's best material, and the duo did progress musically over the course of their five albums, moving from basic folk-rock productions into Latin rhythms and gospel-influenced arrangements that foreshadowed Simon's eclecticism on his solo albums.