Misc: In 1818 Congress decided US flag is 13 ---------- and white stripes and 20 stars.?

Questions

Greenday performed the song "Good Riddance", what other name is this song known as?

Greg Ridley left Spooky Tooth to join what group?

Group stripped of a Grammy for not doing much more than posing for the cover.?

Group that sang ``Want Ads'', #1 hit on June 12, 1971?

Group whose albums include: "In Heat", "Lysergic Emanations" and "Braindrops"?