His explanation for this is given in the sleeve notes, where he says that some of the tracks ('Mars', 'Two Friends', 'Two Brides', ' Slave', 'Frog' and 'Get Me Out of This') were recorded in a more unrehearsed and experimental way than the others.
His explanation for this is provided in the sleeve notes, where he states that some of the tracks ('Mars', 'Two Friends', 'Two Brides', ' Slave', 'Frog' and 'Get Me Out of This') were recorded in a more spontaneous and unstructured manner than the others.