When i play a song and it stops midway, it could be useful to understand that no errors occured and it just loads next part of song. It could some kind of Material UI spinner etc
Add a spinner/indicator that song is loading for users with slow connection
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It should show a progress bar or % loaded, is more transparent and gives more information for the user
Indeed, just a little progress bar within the timeline (like YouTube) would be a good thing! Great suggestion