Tags are usually short (about one line) barbershop arrangements. They're usually used to provide a "showy" ending to a song. But they're often sung alone, without the song, just to have some fun. They're also a good way to quickly learn to sing some barbershop. Here are some tags, taught by James Estes of the Barbershop Harmony Society. The following tag is available on the Barbershop Harmony Society's YouTube channel. Why not give it a try.
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The FinneyLeee Channel on YouTube has some additional tag examples. Below is one example. Visit the channel for others.