Another unsolved case for you to investigate. This one concerns a robbery of very sensitive government information, along with the murder of several former government secret agents. The CIA has captured the culprit, but they have not found any affiliations with other suspects, but you know this was not a lone wolf attack. The only thing you have is the suspect's phone, but it is locked by a four character passcode, which is a combination of letters and numbers (not case sensitive). Once you have found the passcode, you will be closer to finding out who else is responsible for this crime and bring them to justice. Good luck.
What is (*)?
Order of sequence...
Character #1: About me will tell you what you need. It has sown the seed to what great thing? (7)
Character #2: Hiroshima and Nagasaki, for what when? (3)
Character #3: For the readers and gamers, this one's a number. Clancy's Roy G. Biv
Character #4: Note 5 in the key of C.