The 1967 set The Everly Brothers Sing finds the sibling duo applying their impeccable harmonies to tracks with a semi-psychedelic sheen. Before this album, Phil and Don had struggled to adjust to the era's rock trends, even as British Invasion bands like The Beatles and The Hollies acknowledged The Everly Brothers as a major influence. Striving for a more contemporary sound, Sing surrounds Don and Phil with fuzztoned guitars, aggressive percussion, and bubbly woodwinds. The gorgeously melodic “Bowling Green” is the outstanding tune here, letting the Everlys pay tribute to their Kentucky homeland (and earning them their final Top U.S. 40 hit). Patchouli-scented numbers like “Mary Jane” and “Talking to the Flowers” boast covertly hip lyrics and spacy arrangements, while “Somebody Help Me” turns up the rock quotient and “A Voice Within” delivers the bittersweet bounce of Swinging London–style pop. There are a few missteps, such as an overwrought reading of “Mercy, Mercy, Mercy.” Overall, though, Sing is a successful attempt to update the Everlys’ vocal magic with the shimmering colors of the Summer of Love.