First is their cover of Rihanna's "Stay." In the book, Jared sings this to Maddie while playing the piano, which leads to things getting a bit steamy...because what girl wouldn't melt hearing a guy sing this to her? (Also, I saw Thirty Seconds To Mars perform this live last year, it was amazing.)
Second is Lady Gaga's "Bad Romance," which starts out as a song that Jared and Maddie sing together for fun and later becomes pretty important in the book. I knew I had to use this song after hearing Jared Leto sing, "I don't want to be friends." Also, he's playing the piano in this video, which is always hot.
So when you read certain scenes in the book feel free to come back here and watch these videos for the full experience! ;)