If this is blues, it's blues in the Billie Holiday sense, not the Muddy Waters one. This is one of Nina Simone's more subdued mid-'60s LPs, putting the emphasis on her piano rather than band arrangements.
There are plenty of greatest-hits-type collections out there for those interested in Otis Redding's pop and R&B chart impact, and at first glance, Lonely & Blue: The Deepest Soul of Otis Redding seems like another of those, but this is different.