Right
唐 supplies the sound — táng unchanged.
唐 itself originally meant 'extravagant talk' (a hall
广 over a hand
肀 over a mouth
口), later borrowed for the dynasty name; here the meaning doesn't carry. Pure phonetic. Same phonetic also gives
糖 (sugar),
膛 (chest cavity),
搪 (parry, plaster) — a tight táng phonetic family all built around the same right-side component.