Question: Who played the piano in the song "Rolling in the Deep"?
About the article "Rolling in the Deep", section "Personnel".

Candidate passages:
The writers of "Rolling Stone" placed "Rolling in the Deep" at number one on their list of "50 Best Singles of 2011".
Claire Suddath of "Time" magazine named "Rolling in the Deep" one of the Top 10 Songs of 2011.
"Rolling in the Deep" won in the category for Best Track at the 2011 Q Awards.
MTV chose the song as their "Song of the Year".
Amy Lee of the American rock band Evanescence chose the song as her "Song of the Year" while voting Adele as the artist of the year.
"Rolling in the Deep" received the Grammy Awards for Record of the Year, Song of the Year, and Best Short Form Music Video at the 54th annual ceremony. 
 Digital download "Rolling in the Deep" – 3:48 Digital EP "Rolling in the Deep" – 3:48 "Rolling in the Deep (Jamie xx Shuffle)" – 4:17 "Rolling in the Deep (Acapella)" – 3:56 "Rolling in the Deep (Avicii Remix)" – 4:25 CD single "Rolling in the Deep" – 3:48 "If It Hadn't Been for Love" (written by Mike Henderson and Chris Stapleton) – 3:09  
  The song that plays over the teaser is "Firesuite" by Doves from their album "Lost Souls."
The song that House plays on his piano at the end of the show is "Cuddy's Serenade" by Hugh Laurie.
The song includes an interlude of "You Can't Always Get What You Want" by the Rolling Stones.
The song playing during the scene where Taub talks with Ryan is also the same song played in the opening of DNR.  
"Rolling in the Deep" first gained attention when it was used in a trailer for the film "I Am Number Four" and in the film itself.
It has since been featured in several television series such as in "90210" third season, in "Doctor Who" sixth series premiere, in "One Tree Hill" eighth season, in "Gossip Girl" fourth season finale, and in "The Secret Life of the American Teenager" fourth season.
"Rolling in the Deep" was used as the theme song for E4's reality series "Made in Chelsea" and appeared in "So You Think You Can Dance" eighth season during contestant Mitchell Kelly's solo performance.
The instrumental of the song was used in Apple Inc's marketing video for the iPhone 4S.
It was also featured in CBC's intro to Game 1 of the hockey 2011 Stanley Cup Finals between the Vancouver Canucks and the Boston Bruins.
while the song's instrumentals were played heavily in promos during the 2011 NBA Draft.
The song was played in the background during the parade of athletes at the 2012 Summer Olympic Games. 
It was a jam recorded in 1971 at Headley Grange by Island Studions, London, where the band had done most of the recording for their fourth album.
They were using the Rolling Stones Mobile Studio and were accompanied by Rolling Stones' road manager and pianist, Ian Stewart, who ended up jamming with the band on piano.
According to Jimmy Page this song would not have emerged had it not been for the particularly informal 'live-in' environment at Headley Grange where it was recorded:It has been reported that Plant played guitar on the track (Page playing mandolin).
The slapping guitar came from an overdub session with an ARP guitar synthesizer.
Bonham's drumming was improvised in the studio.
The song was never performed live.