There are two musicians called Roger Manning.

Roger Manning is a New York City based singer-songwriter who plays an aggressive acoustic style of music. Manning, along with a small handful of other artists composed the original New York City anti-folk scene.

Reference: http://en.wikipedia.org/wiki/Roger_Manning

Roger Manning #2 is more-often known as Roger Joseph Manning Jr.. He was keyboardist and founding member of the band Jellyfish and is a solo artist and session musician. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.