bennyrunner
New Head-Fier
Thank you.Go to:
https://apkpure.com
Download your favorite music apps (e.g. Tidal, Spotify, etc.) onto your MacBook.
Use AndroidFileTransfer app, which you usually use to transfer your music files to your SPK, and copy APK apps under 'Open Service' folder.
Details can be found on the FAQ:
https://www.astellnkern.com/eng/content/support/faq/view.asp?li=1000606