That's easy
Just go take a look at the homepage (Afterhours Radio - Free Internet Trance Radio). You'll notice a 'Live Playlist' written at the top of the page on the right. There you will see what's on air, meaing what's currently playing. Plus the last 5 and next 5 shows. And all the way at the top right corner you'll also see a small window next to the Afterhours logo that says 'On Air Now' and there you have it.