ABBA gained international popularity employing catchy song hooks, simple lyrics, and a Wall of Sound achieved by overdubbing the female singers' voices in multiple harmonies. As their popularity grew, they were sought after to tour Europe, Australia, and North America, drawing crowds of ardent fans, notably in Australia. Touring became a contentious issue, being particularly unpopular with Faltskog, but they continued to release studio albums to great commercial success. At the height of their popularity, however, both marriages of the band members failed, and the relationship changes were reflected in their music, as they produced more thoughtful lyrics with different compositions. They remain a fixture of radio playlists and are one of the world's best selling bands, having sold over 370 million records world wide; they still sell two to four million records a year. This Pro Vocal series contains the lyrics, melody, and chord symbols for eight of their hit songs. The CD contains demos for listening, and then separate backing tracks so you can sing along. The CD is playable on any CD, but it is also enhanced for PC and Mac computer users so you can adjust the recording to any pitch without changing the tempo! Perfect for home rehearsal, parties, auditions, corporate events, and gigs without a backup band. Or for singing just for the fun of it!