an influential group in the years leading to the rise of symphonic and Argentine progressive rock. Its albums were acclaimed nationally and by progressive rock fans worldwide. Another symphonic/progressive band was Crucis. Their music began attracting attention in the underground, and so they started getting bigger performing venues. As change swept Argentine rock in 1975, their music was rapidly rising to popular musical tastes. Their compositions were strong and dynamic with unexpected breaks, and the interplay between the electric guitar and keyboards captivating. The rhythm-section sounded powerful and adventurous. Espíritu, who formed in 1973 but had roots since 1969, would go on to be an internationally followed group in the latter part of symphonic rock's heyday. The first album Crisalida is cited as their best effort, with beautiful and alternating compositions and changing atmospheres (from mellow with acoustic guitar to up-tempo with heavy electric guitar), lush keyboards and some vocal harmonies. Former heavy rockers El Reloj turned to prog with 1975's self-titled album. Their sound has been compared to Uriah Heep's mystic and proggy sound. A symphonic band that would have a great year in 1976 was ALAS. Their music was even more intellectual and unorthodox. ALAS would feature artists such as Rodolfo Mederos and Pedro Aznar. Luis Alberto Spinetta would begin his third band Invisible later in that year. Their symphonic sound tinged with tango would bring critical praise. A band that showed a lot of promise that never materialised was Reino de Munt. Formed by Raul Porchetto, it featured a young Alejandro Lerner, and musicians like Gustavo Basterrica and Frank Ojsterseck. Charly García formed his first post-Sui Generis band, La Máquina de Hacer Pájaros, which began Garcia's explorations of symphonic and progressive rock. Other symphonic and progressive bands of renown would be Torax, Ave Rock, Anacrusa, and Materia Gris. Arco Iris meanwhile continued expanding on their symphonic-folk rock and were joined by veteran Chilean band Los Jaivas, whom were escaping the Pinochet dictatorship that had come to power in their nation in 1973. The two along with Contraluz were the main exponent of the subgenre. On March 24, 1976, the democratic government was toppled by a military coup. It opened one of the darkest political chapters in Argentina's history, full of repression, fear, and missing citizens. Argentine rock by no means would be immune to the military crackdown, and would suffer the worst period of censorship in its