If the goverment shuts down, will my saving bonds that I currently own be worthless?

• money market savings accounts
• sell music

Also do they have to guarantee the saving bonds that I will get my money? Do you think I should cash them in or just let them keep making interest? Most are from before 1995.

Additional Details

All the bonds aren't completely interest matured.

If the goverment shuts down, will my saving bonds that I currently own be worthless?