Pedro Tudela and Miguel Carvalhais collaborate as @c since 2000. They have released and performed extensively, often collaborating with other artists and collectives in a practice marked by radical experimentalism with computational sound. In 2003 they established Crónica, a label dedicated to experimental music and sound art, that they since run.
Since 2005 Tudela and Carvalhais have also been developing sound installations, the majority of which are ephemeral works lasting for the duration of an event or festival. The book “Installations / Instalações” documents nineteen of these works, offering a detailed look at them through visual documentation and texts by Carvalhais and Tudela and Raquel Castro, sound art curator and artistic director of Lisboa Soa.