who is the second person?
American singer and songwriter
Bonnie McKee
Bonnie McKee (born January 20, 1984) is an American singer and songwriter. 
katy perry this is the part of me song UNANSWERABLE who wrote the lyrics of this? Katy Perry and Bonnie McKee
wiki:18014738
Bonnie McKee [SEP] Introduction
Bonnie McKee (born January 20, 1984) is an American singer and songwriter. Her debut album, "Trouble", was released in September 2004 under Reprise Records. After being dropped by Reprise several years after its release, McKee had taken a musical hiatus before establishing a name for herself as a songwriter. McKee has written 10 singles that have reached number one in the United States or the United Kingdom, which have sold more than 30 million copies worldwide combined. After sometime of focusing on songwriting, McKee released "American Girl" in July 2013. McKee is particularly known for collaborating with pop singer Katy Perry, and the duo has written the hits "California Gurls", "Teenage Dream", "Last Friday Night (T.G.I.F.)", "Part of Me", "Wide Awake", and "Roar" together.