Progressive rock emerged from the sound experimentation era of the mid to late 1960's. Groups such as the Beatles, Pink Floyd, and The Moody Blues pushed the limite recording abilities to the limits and began making music later labeled as, "Progressive Rock" by the end of the 60's. The Beatles' 1967 album Sgt Pepper's Lonely Hearts Club Band, often regaurded as the first concept album as well as the birth of album oriented rock was the first of several major breakthroughs in recording technology and progressive rock. By the end of the 60's rising progressive groups such as Genesis, Yes, and King Crimson had released debut albums, with others such as ELP and Rush releasing albums early the next decade. The 1970's saw the peak of progressive rock. Although many of the gernes forerunners continuing to sell sucessfull albums well into the 1980's. However by the late 70's to early 80's progressive rock saw a decline, many of the now veteran music groups splitting up, going through irreperable lineup changes or changes musical nature altogether. While true Progressive Rock is now a thing of the past, many bands labeled as "Neo-Progressive" groups have been forming as far back as the early 1990's.