Here are the stories TIME is watching this Tuesday, May 20:
- Big money fuels a mini Super Tuesday for Republicans with primary elections in Arkansas, Georgia, Idaho, Kentucky, Oregon and Pennsylvania.
- Thailand institutes martial law, but insists there has been no military coup.
- Fans clamor for Jay-Z and Beyonce to really make a film for their tour's faux movie teaser 'Run.'
- Led Zeppelin gets sued for possibly plagiarizing the opening notes of "Stairway to Heaven" from the Spirit song "Taurus."
The Brief is published daily on weekdays.