'Sound Pieces' and the quartet tracks with Steve Kuhn came out in that ABC/Impulse 'Dedication Series' twofer that came out in the 70s. Excellent stuff. Notable for some of the thinnest vinyl ever consigned to a gatefold though. 'Sound Pieces' is an ambitious and very well executed suite that is (as mentioned) in the Mosaic - some of Nelson's most ambitious writing for expanded orchestra with french horns, two basses, expanded trombone section etc.. His soprano solos on the Suite are particularly good !