H/T to Jeffrey Tucker at the New Liturgical Movement for these resources, which I plan to add to my sidebar.
The first three come from a source where nearly all chants are stored online (since 1994). Each of these three categories contains not only recordings (quality varies), but a second icon containing the actual notes. Here it is broken down:
In addition, Musica Sacra has an ongoing list of communion antiphons with Psalm verses
The other day, Chris of Regina Caeli provided me with a tip that Jenny, on her blog, Cor Immaculatae, provided this gem. The link below will take you to a site that provides "streaming chant". Imagine that!!! In addition, there are other Chant resources online at this site.