Helpers and demos for working with MediaStore song lists

Despite the project being named "media", there are no APIs or helpers to work with MediaStore. I believe a helper to execute MediaStore.Media.Audio queries that returns a list of MediaItems (automatic conversion from cursor fields to MediaItem) would deduplicate a lot of code people have to write over and over again, and there is basically no reason this piece of code cannot be shared across all apps.
I am also interested in a demo showcasing how to handle playback resumption with MediaStore, as MediaStore sometimes needs some time to load and rescan storage and SD card after boot and media IDs won't resolve fast enough to be used in onPlaybackResumption(). I currently serialize the entire MediaItem playlist to disk, but I am curious if there is a better solution.