"Gangnam Style" actually is a good karaoke song, if; 1. You know the lyrics OR 2. You are Korean and with Korean friends I could list a # of good Korean karaoke songs, but I highly doubt many of you listen to Korean songs. But, if you do just wall me.
"Too Close" by Alex Claire turned out to be one of the best karaoke songs I have ever done. Instant chick action if you can hit the notes.