Resource suggested and introduced by Carlton Gay (here:

This is a free simple site with about 300 recordings that has a nice user interface that provides a lot of resources on each song page and it cues to the music well. The Pinyin is visible and there is also a Pinyin typing drill to match characters. I like many songs and can listen to them repeat without getting bored. Each songs character set can be studied with a simple drill and there are biographies of the artists and cross-linked lists by difficulty level. The social commenting aspect seems to be unused which is too bad.