Before the start of the recording of the LP "Rock Radiactivo" released in 1990, the Portuguese Mata-Ratos made a series of pre-recordings at Hipolab Studios (Oeiras, Portugal) and then gave them to the producer to pick out the ones that should be recorded for "Rock Radiactivo". This session of 4 tracks has now been recovered and released on vinyl for the first time. 4 tracks!

1. Armando é um comando
2. CCM
3. Jardim da celeste
4. Xavier