This app was mentioned in 7 comments, with an average of 1.29 upvotes
nativedsd.com is the place to go, but the vast majority of their catalogue is jazz and classical music. Then you have DSD64 files from SACD rips or even SACD iso downloads from which you can extract the DSD yourself. These are available on various sites that I won't mention here.
But DSD does not have to be native only. If you want to convert the music you already have to DSD to discover how different it sounds, the cheapest option is Onkyo's HF Player app. It has a paid option that will remodulates any music file up to DSD128. https://play.google.com/store/apps/details?id=com.onkyo.jp.musicplayer
It may be stock on the DP-X1, but it's available on android and called the "Onkyo HF Player". Doesn't look exactly the same, but it's quite functional.
https://play.google.com/store/apps/details?id=com.onkyo.jp.musicplayer&hl=en
Under EQ for Android, please add Onkyo Music Player. It supports graphic PEQ and is free.
Onkyo This is a much better PEQ.
afaik, there are no magic programs that can detect an unknown track and assign it to the correct artist, album, year, etc. A number of players can get you some info off the net if you have at least the track name and artist listed. You have to do the rest of the hard work yourself. Programs like iTunes makes the process easier, better than any id3tag editors I have come across, and I have tried a lot of them. It also made converting from CDs easier adding album details and all the necessary tags with info pulled from the net. The info was never wrong for over 50 CDs I bothered to convert but the last time I had to do that was over 5 years ago. I don't know if there are better ways to do that now.
This is the painful part of maintaining a large audio library - maintaining some semblance or order. I used to have one over 10 gigs, all of it ordered and tagged. Then one day I decided to delete all the music I don't particularly enjoy or listed to frequently enough. If I had a really bad urge, i could just get the CD, download the track, or stream it. My hard disk suddenly had 7 Gigs of free space, and I loved my cleaner library. A purge may hurt at first, but is much needed. Then again, I do do not like background music. When I am listening to music, that is the only thing I am doing. My eyes are probably closed, and the lights are probably out too. For people who enjoy music in the background while they do other things, a lean library may not be an option.
Edit: BTW, if you ever wanted a player that can detect every file on your phone, including pesky ads that some apps download and keep hidden, try the Onkyo HF Player. By itself the player is quite nice, Proprietary sound engine means it sounds incredible. The fact that it also plays every vid you have on your device (ads, porn, music, etc) as an audio file is the only annoying part. I could not get it to delete the other files from its library even after I assigned it only the music folder. Only annoyance, but it can be a major one.