iTunes oddity

Some tunes that I've been listening to on my playlists for years have greyed-out on my iPhone6 (latest iOS update installed 11.0.2). There's a funny looking icon on those items as well. Yet they play fine on the playlists on my home computer. I've synced a couple of times, also tried dragging/dropping the list to the phone, no dice. Is this connected to the iOS update? Is there a fix?

Thanks.

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