Aretha Franklin -- the legendary Queen of Soul -- is set to undergo a medical procedure Thursday, but no one will say what the procedure is, RadarOnline.com can report.
Franklin, who Rolling Stone ranked atop its' list of of The Greatest Singers of All Time, said "all prayers are good" in a statement to her fans, who held a vigil Wednesday in downtown Detriot in her honor.
Franklin, 68, on doctor's orders, last month cancelled all of her future concert dates through May 2011. Her spokesperson Tracey Jordan declined to comment on the Respect singer's current condition, or what type of procedure she'll be undergoing.
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Franklin last year was the only singer invited to perform at President Barack Obama's inauguration ceremony.