Use these Airboss frequencies from Live AirTraffic (LiveATC.netto listen in to real-time radio transmissions from the pilots during the Thunder airshow. This link provides access to conversations between the airshow pilots and the airshow air traffic controller -- also known as "The Airboss."
Click here to access the feed on your computer via the Standiford Field page under "Thunder Over Louisville" link: http://www.liveatc.net/search/?icao=ksdf.
LiveATC.net also has an iPhone app (http://tinyurl.com/kpmsmd) and a mobile site (http://m.liveatc.net) to enable listening from your mobile device. You can find the Thunder feed by searching for SDF.
The feed will remain silent until the air show starts.