  The relationship between the classic magnetic resonance density matrix
relaxation theories of Bloch and Hubbard, and the modern Lindbladian master
equation methods are explored. These classic theories are in full agreement
with the latest results obtained by the modern methods. A careful scrutiny
shows that this also holds true for Redfields later treatment, offered in 1965.
The early contributions of Bloch and Hubbard to rotating frame relaxation
theory are also highlighted. Taken together, these seminal efforts of Bloch and
Hubbard can enjoy a new birth of contemporary relevance in magnetic resonance.
