To block songs, first select Major Label or Indie under UMix Playlists. Then click the magnifying glass in the Actions column.
Click the box next to the song or artist. Blocking a song or artist will block them throughout your entire account in all playlists. Unchecking removes the block.
You can see all blocked songs and artists in one place on the Blocked Songs tab. To unblock, navigate to Songs > Blocked in the left menu and click the unblock icon in the Actions column.
You can also block songs or artists directly from your Player Log Details. Use the filter to show only song play events. Unchecking removes the block.