US STOCKS-Wall Street's 3-day rally set to end as oil slips
* Indexes reverse course after higher open
* Crude resumes slide
* Pandora soars after comments on new music royalties
* FedEx rises after Q3 profit beats view
* Indexes down: Dow 0.82 pct, S&P 0.99 pct, Nasdaq 0.77 pct (Updates to early afternoon)
By Abhiram Nandakumar
Dec 17 (Reuters) - Wall Street looked set to snap a three-day rally on Thursday, dragged down by energy and materials stocks, a day after the Federal Reserve raised interest rates for the first time in nine years.
Crude oil prices resumed their slide after gaining earlier in the day on persistent oversupply worries and as the dollar hit a two-week high. Exxon was down half a percent, while Chevron slid 1.4 percent.
Fed Chair Janet Yellen's assurance that further tightening would be gradual boosted global stock indexes. Continuación...