The song playing in car Christopher’s car when he turns the sound system up. It’s a song by German electro-industrial metal band Rammstein, from their 1997 album Sehnsucht. The song was a #5 hit in Germany, and went to #20 on the Billboard Mainstream Rock Songs chart in the US.
The song’s title translates to “You have” in English, but in German is a play on words with the homophone Du hasst, meaning, “You hate”. Possibly a slightly threatening song to arrive with, although it’s another reminder that Lorelai and Chris are both heavy metal fans.