Their seven albums on the Deram and Threshold labels from 1968 to 1974:
In Search of the Lost Chord DES 18017
On the Threshold of a Dream DES 18025
To Our Children's Children's Children THS 1
A Question of Balance THS 3
Every Good Boy Deserves Favour THS 5
Seventh Sojourn THS 7
This is the Moody Blues THS 12/13 (double album compilation)