We don't have the audio at LabROSA, so there's nothing for us to give you. The features were mainly created in-house by content owners, using analysis code supplied to them by The Echo Nest.
You can, however, use services like 7digital or playme to preview a song; we provide demo code. Grooveshark is also very powerful (but is it legal? anyone?)
If you do have audio, you can analyze it and turn it into the same format as the rest of this dataset (see below in the FAQ).