I do use Lidarr! It pulls from the MusicBrainz database, so you can only really search and add tracks that were released as a single. My use-case is to download albums and monitor new releases from my favourite artists, and it does a good job at that. I use LunaSea on my phone to add stuff to Lidarr, Sonarr, and Radarr.

ViMusic and InnerTune are both clients for YouTube music on Android. I prefer Innertune’s interface, but it seems like ViMusic might have an import feature? Personally I stream my music collection from my Jellyfin server with Finamp.

I lost my iPod classic some years ago 😢 I used to use the same rockbox theme as you, I miss it so much.

My most useful is probably ntfy & my matrix client, Element. I self-host ntfy & a matrix dendrite server with some bridges. I am able to receive notifications from all of my chats without Google services installed, as well as notifications from Tusky thanks to Element and Tusky’s support for UnifiedPush.