Synthesis is the fourth studio album by American rock band Evanescence. It was released on November 10, 2017, by BMG Rights Management. The album includes reworked versions of the band's previous material with an orchestral arrangement and electronica music elements, in addition to two new songs. David Campbell was responsible for the arrangement, along with Amy Lee and producer William Barry "Science" Hunt. In order to promote the new material, Evanescence embarked on the Synthesis Tour, which opened on October 14, 2017, in Las Vegas and continued in cities across the United States and Canada until December.