There are lots of places you can get HD tracks depending on if you want to pay or get them for free. Hdtracks.com is one of my favorites.
I've already finished organizing my Vinyl & HR into 4 folders (1 64GB and 2 32GB folders) and I’m all set to upload them to DX100.
Most of these are 192khz/24bit and some are 96khz/24bit
Adele 21, Michael Jackson full collection, Grease movie sound track, Disney songs, Shania twain, Lady GAGA, Red hot chili peppers (most of their albums), Coldplay (most of their albums), The Beatles (all their albums), Al Stewert year of cat, bob Marley (everything), Metallica (all their cds), Santana (all their CDs), System of a Down (a lot of their stuff), Eric Clapton (all his songs), Eagles (hotel California and acoustic version) Tool (all their cds), Ottmar Liebert up close, and some classical music.
Around 208 acoustic flac songs at 44.1Khz/16bit.
308 songs as flac and MP3 with bitrate of 320 and few with bitrate of 256+..