Following the release of "Get Over You" in February 1979, the Undertones' eponymous debut album was released in May. The primary lyrical concern of the songs focused upon youthful relationships and adolescence. Three further punk singles "Jimmy Jimmy", "Here Comes the Summer" and "You've Got My Number (Why Don't You Use It?)" were released between April and October 1979, each to critical acclaim. In September 1979, the Undertones toured the United States for the first time, supporting The Clash with eight concerts in six different States.