Conversation so far:
what was Kat-Tun Real Face?
Real Face is a song written for the debut single and debut album of the Japanese boy band, KAT-TUN.
what is Kat-Tun?
KAT-TUN is a Japanese boy band.

Question: what songs were on the album?
Self-contained rewrite: what songs were on the album Best of Kat-Tun by Japanes boy band  Kat-Tun?