Concèntric surrounded itself with true professionals to issue records in Catalan. Each detail had to be well thought out and the products had to be high-quality. The writer and singer Josep Maria Espinàs and the musician Francesc Burrull were in charge of the quality of the lyrics, music and recordings.  

Josep Maria Espinàs i Francesc Burrull, moderat per Joaquim Vilarnau.