Hi Vincent, Nouns are usually singular when they describe another noun. A shoe store. A race track.
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Vincent TeoCan I say,
(a) There is / are a CDs rack. -- There is only one rack. Try this one again.
(b) There are some CDs in / on the rack. -- I think either preposition works.
(c) The CDs rack got some CDs. -- People get things. The C