Internet radio: for example, one might enjoy the "radiodroid2" app on an Android phone, or similar. There seem to be thousands of stations.

• (Or other internet radio & music streaming; there might be other good apps. It uses network data.)
• There seem to be free radio stations for everything (thousands: styles, countries, languages, etc), and a nice UI, even to record, if desired.
• I have no direct affiliation with it though.
• It comes from the free app store whose .apk file one can download at f-droid.org , then "side-load" (install).
• (One might have to change phone settings first, to allow installing apps from downloaded files. Could change it back after installing f-droid, if desired.)
• Everything at that app store (they say) is built from Freely-available source code, and so can be inspected, learned from, redistributed...
• And the apps are much less likely to have malware, it would seem, than other app stores.
• There is much there and it is fun to browse.