The complexity of carbon chemistry means that there are many molecules that have a mirror image counterpart that is essentially different, that is, the two cannot be rotated into one another. They are in one sense chemically the same, but living things can tell the difference. The difference in the smell of oranges and lemons is caused by right and left forms of limonene. In many cases, such as with amino acids, only one stereoisomer of the pair is found in living things.
Consider, if you will, the new Radio in our Internal Links section. The songs on the playlist are a subset of those from which our infrequently-rotating lyric-headers are drawn. For now the list is in alphabetical order, because I am a constant slave to default settings.
The player requires Flash, but it has some basic and useful right-click functionality.
Let me know if you have any problems or suggestions.