Yes. Content that has been removed from sale on the store but has not been flagged as unavailable for redownload will still be available to customers for iTunes Match as matched content and for iTunes in the Cloud.
If you make content unavailable for sale, you should leave it up for iTunes Match and iTunes in the Cloud unless you've lost the rights to do so.
If content is flagged as unavailable for redownload, it will be treated as unmatched content for iTunes Match subscribers.
Content will not be available as matched content for iTunes Match subscribers or through iTunes in the Cloud if there is no contract in place, the content is part of a legal dispute, or the content is not on the store and has been flagged as not available for redownload. iTunes Match subscribers will still be able to access it as unmatched content.
If the content is not available when a customer attempts to download a past purchase, we will attempt to find an equivalent and, if an equivalent is found, will pay the provider of that equivalent.
No. Whether store content is available for iTunes Match and iTunes in the Cloud is not affected by whether it’s sold on the iTunes Store a-la-carte or as album-only.