Bing Crosby, Ken Darby Singers, John Scott Trotter & His Orchestra refers to recordings and performances featuring American singer Bing Crosby accompanied by the Ken Darby Singers vocal ensemble and the orchestra led by John Scott Trotter. Crosby, a seminal figure in 20th-century popular music, was active primarily from the 1920s through the 1970s and is associated with traditional pop, vocal jazz, and popular standards. The Ken Darby Singers were a professional vocal group known for close-harmony backing vocals in radio, film, and recording sessions, while John Scott Trotter was an arranger and bandleader who collaborated with Crosby as musical director, providing lush orchestral arrangements and studio accompaniment. Together they produced well-crafted, melodic popular recordings and radio performances characteristic of mid-20th-century American mainstream popular music.