the wake of Los Gatos, several bands emerged, including Luis Alberto Spinetta's Almendra, and Manal. The three are considered the founders of the Argentine rock movement. None of these groups would have an extended history: in fact most disbanded by the early 1970s. The early Argentine rock scene was characterised by a lot of line-up changes in bands, and even member swapping between bands, or members of different bands meeting and forming new groups. However, the shuffles provided for a lot of experimentation and creativity. Almendra split in 1970 and Spinetta formed Pescado Rabioso, and the remaining members started Color Humano and Aquelarre. Spinetta's album Artaud was considered the greatest Argentine rock album of all time by the Rolling Stone Magazine. In 1970, Vox Dei refreshed the movement. Their album "La Biblia" (The Bible) is one of their most famous works of the early 1970s. In that same year, the first B.A (Buenos Aires) Rock festival became the first showcase of a rising subgenre that would predominate the first half of 1970s Argentine rock. A new group of musicians was to bring new ideas to the mixing bowl of early Argentine rock. Acoustic and heavy rock By the turn of the decade the first real diversification in Argentine rock start taking place, although the split had been brewing even before, as some bands began playing much heavier music, with the world of rock entering the Heavy metal era. Among them, Pescado Rabioso, Vox Dei, and Billy Bond y La Pesada del Rock. Pappo's Blues was acknowledged as one of the greatest guitarist of all time by B.B King, who invited him to play in the Madison Square Garden. Another important but overlooked heavy rock act of the period is El Reloj, but they would drift towards progressive rock in the following years. Conversely, the first B.A Rock festival (now promoted by Pinap magazine successor Revista Pelo), had many of the artists and bands that would lead the Acoustic rock movement: Gustavo Santaolalla forming Arco Iris, León Gieco's folk-rock hybrid, Sui Generis and the start of Charly García's music career, Raul Porchetto, and Pedro y Pablo, among other bands. The proliferation of these bands and their increasing popularity, the early 1970s being the height of the hippie movement in Argentina, led to the Acusticazo of 1972. Several acoustic rock bands would gain popularity from their performances there, including Vivencia, Pastoral, and