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 were 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.