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The closest teleological cousin we can think of to "chamber pop" is Chamber Music, Joyce's (terrible) book of poetry, which title, though, puns on and refers to the tinkling sound of a woman making water in a chamber pot. So when critics (it's always critics, the lice between the sheets of great art) use the phrase "chamber pop," what they're doing is pissing all over your record. So critics: stop using it.
And Amazon? There is no genetic trait linking Evanescance; Sigur Ros; Rufus Wainwright; Goldfrapp; and Brian Wilson. Except overwhelming whiteness. So is that what Amazon thinks chamber pop means, namely whiteness?