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The on air versions are never the full songs, there are always edits of both lyric and music on air. Time and timing both being factors, and at times the story being told is a factor, a lyric might be highlighted or repeated because of the place it has in the story line, as it is being used to make musical comedy using pop songs. Time a much greater factor on Glee than on some morning show, which makes the OP a bit off in my view. GMA can put the ads where they wish, it is a live show that does in fact adapted to live events.
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