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

Candidate passages:
  Adele A.- Rolling in the Deep  Afrojack - Give Me Everything  A Great Big World - Say Something  Akon - Sexy Bitch 
 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 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. 
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. 
The song has received acclaim for Adele's vocals, its lyrics, and instrumentation.
"The Sun" called the song "an epic, foot-stomper of a pop anthem with thumping piano and a vocal you would expect from a veteran of 20 years on the road."
Lamb gave it a perfect score of 5, saying: "'Rolling In the Deep' [...] wastes no time in presenting the stunning bluesy authority of her voice.
Less than five seconds in she begins proclaiming the rise of emotion that results in fantasies of revenge against a lover who has done her wrong.
Hers is a voice that can raise chills up the spine, and, when she is in a mood like this, the sense of foreboding will rivet your attention."
Jason Lipshutz of "Billboard" magazine complimented the song's "sweeping chorus" and felt that the song "places a similar emphasis on its refrain but its multilayered instrumentation gives the English singer's wail a previously unheard depth".
Lipshutz also praised Adele's vocal performance by writing, "Adele's noticeable leap in vocal confidence highlights the track.
She gracefully lingers on the last line of the verses and attacks the sorrowful chorus' first words, 'We could have had it all,' head on."
"Rolling Stone" magazine's Barry Walters gave the song a positive review stating, "'Rolling in the Deep' finds the 22-year-old in bluesy gospel mode, sounding powerful but not particularly pop.
Starting with a stroked acoustic guitar, this breakup-mourning track builds to a stomping, hand-clapping climax that affirms the British knack for rejiggering the sound of American roots music."