I checked spotify this morning and my saved Matt and Kim songs, such as their hit "Daylight," were missing. So, I checked their page and their first two albums are missing. Only their new album New Glow, some singles, and remixes are there. Any ideas if this is a choice they made or a spotify maintenance issue?
The reason is that the artist or their music label has likely decided to remove it from Spotify.
The availability of music on Spotify is up to the artist and their music label.
Spotify wants all the world's music, and they're working hard on making this happen for you. However sometimes agreements can't be reached with the artist or label or a change may happen in music ownership. Sometimes the music is only available in certain countries, while access is blocked to others. Sometimes the album or song will be unavailable temporary, and come back again later.
Spotify adds thousands of albums and artists are added every day. If you can't find an artist you're looking for, they may appear (or reappear if removed) soon.