Skip the Quick Search step. In the black boxes to the right, choose 'Search' and enter 'piano' in the 'Search' box. You may have to experiment with which index to specify to retrieve good results. It defaults to 'Album Titles', but try 'Work Titles' as below.
Select 'Advanced Search'. Enter 'Debussy' as composer and enter 'piano' under Instrument. Click 'Search'.
From the results list, click on album cover of a selection, select the tracks (or click 'Select All') and 'Play Selections'.
The Player opens in a separate window.
Enter keywords in search box.