Music history of the United States in the 1960s and symphonic music, is often taken as the key recording in progressive rock, helping the widespread adoption of the genre in the early 1970s among existing blues rock and psychedelic bands, as well as newly formed acts. Chubby Checker during the early 1960s popularizes the enduring dance craze The Twist with his hit cover of Hank Ballard's R&B hit "The Twist". Gerry Goffin and Carole King become a very influential duo in pop music, writing numerous number one hits including the first song to ever reach number one by a girl group, The Shirelles "Will You Love Me Tomorrow" and
Wales in the Early Middle Ages the dynasty of Meurig ap Tewdrig in connection with the kingdoms of Glywysing, Gwent and Ergyng, there is a near-complete absence of information about many other areas. The earliest known name of a king of Ceredigion was Cereticiaun, who died in 807, and none of the mid-Welsh kingdoms can be evidenced before the eighth century. There are mentions of Brycheiniog and Gwrtheyrnion (near Buellt) in that era, but for the latter it is difficult to say whether it had either an earlier or a later existence. The early history in the north and east are somewhat better known, with Gwynedd