Pop star Marky Mark has been recruited to entertain
Mercator this week. Cal has also arranged for the prince to receive knowledge about sound effects. And, looking forward to National Music Day on 28 June, what weird and wonderful instrument will be played for his pleasure? With
Roddy Maude-Roxby , Helen Atkins , Jenny Bolt , Dominic McHale and Kevin Williams.
Executive producer Jill Roach Series producer Glyn Edwards A Roach production for BBCtv .STEREO
0 EARTH-KNOWLEDGE: if you want to send a message to Mercator, or deliver your knowledge in person, write to P9, BBCtv, PO Box 9000, London W 12 8ZZ.