Sir Michael Tippett composed this concerto in 1949 as concert for two trios. He drew his inspiration from the baroque Concerti Grossi of Händel and Locatelli. In his composition, the orchestra forms a backdrop to a large ensemble, consisting of two trios talking to each other. In the usual stereo setting this is reflected by a left and a right trio. In this one left is formed by the solo players mentioned on the cover, and the right by the principal players of the orchestra.
What is refreshing about this setup is that there is no focus on the violin, but it is also not a chamber music piece. This specific combination is rare, and worth a try.
The composer Tippett was active until well into his 90s, and died in 1998. This piece is part of what can be seen as his middle period, where he had a fascination with baroque form. He also wrote a typical baroque oratorio (just like Händel) during this period.