Astronomy Class is a trio made up of producers Chasm, Sir Robbo and vocalist Ozi Batla. John Maddox undertakes bass duties live and on record, while The Tongue adds vocal backing to the live ensemble. Their 2006 debut Exit Strategy announced a refreshingly reggae influenced hip hop sound, building on the diverse musical backgrounds of the trio. Two singles received lengthy airplay on triple j, A Bright Tomorrow and Done the Sums, while two impressive national tours consolidated their presence in the Australian music scene.