"But Dennis was a really solid musician, and we really needed somebody who could play bass like him"

This quote by Neil Innes is referring to the late Dennis Cowan, a bassist who was part of the band The Rutles. Neil Innes was a member of the band and was praising Dennis' musical ability. He is stating that Dennis was a very skilled artist which he was a crucial part of the band. He had the ability to play the bass guitar with fantastic skill and accuracy, which was something that the band needed. Neil Innes is revealing his admiration for Dennis' musical ability and how essential he was to the band. He is likewise highlighting the importance of having a talented artist in the band, as it can make a huge difference to the overall noise. Dennis Cowan was an essential part of The Rutles and his skill and talent will be remembered for a very long time.