I'm quite disappointed with this first attempt. The very first selection I attempted to play was a dismal failure. This was the work "Da Pacem Domine", composed by Arvo Pärt and played by the Hilliard Ensemble, from the Album "Arvo Pärt: Lamentate" on ECM New Series 1930.
I searched for composers using "Part". Arvo Pärt was listed first (great). Selected him. Selected "See All 94 Works". Selected sort order as "Name of Work". Hmm, no "Da Pacem Domine". Okay, so I try using the "Search" function at the bottom of the screen. I search for "Part Da Pacem Domine". Not found; the only work found is "An den Wassern zu Babel sassen wir und weinten" by Arvo Pärt, which, as you might notice, doesn't even have "Da Pacem Domine" in the title.
Okay, I browse for the album. Back to Arvo Pärt, select "See All Albums" and it brings up a list of hundreds of albums within an infinite scrolling list. I select "Title" for sort order, then scroll and scroll and scroll. No entry for "Lamente", nor "Pärt: Lamentate" ; there is one "Arvo Pärt: Lamentate", but not the one from ECM. There is no alphabetic shortcut along the right-hand edge or anything to jump to album titles beginning with a certain letter. You have to do two fast scrolls, which then pauses for loading more, then repeat that 30, 40, 50 times or more.
So back to "See All 94 Works", sorted by Title. I look for another work from the same album I am trying to find, "Lamentate", which shows it available on 7 albums. I select that work. Under Popular Recordings, I see the one from the album I am looking for listed. I select that entry. Below the listing of the tracks for Lamentate, it shows "Featured On" and shows the album (that couldn't be found under albums, as described in the previous paragraph). I select the album, which, lo and behold, shows "Da Pacem Domine" as the first track, only it's listed as a movement name under the work name "An den Wassern zu Babel sassen wir und weinten", which isn't right at all.
The app badly needs filters and alphabetic shortcuts to navigate lists of hundreds of entries. Then there are all all the metadata problems which will probably never get fixed, as there is no mechanism to report them.