Whitney Houston was "excited" during her final recording session, producer Harvey Mason Jr. has revealed.

The singer visited a studio in North Hollywood on February 7 to record the up-tempo song Celebrate.

The song was set to be a duet with American Idol winner Jordin Sparks. The two singers are co-starring in upcoming movie Sparkle and were working on the soundtrack.

People magazine spoke to Harvey who said that the Bodyguard singer was feeling "really positive" just days before she passed away in the Beverly Hilton hotel.

"We stood around and joked, listened to music, and we got her this throat coat tea she likes," Harvey revealed.

"Then she got in the booth, started her vocal session with a prayer as she always did, and worked for about three to four hours.

"We ended the session dancing around the control room while she said, Turn it up! Turn it up!' She was so fun-loving."

Harvey added that the 48-year-old didn't want the music to be "anything less than perfect".

"She was excited, not overworked," Harvey said. "She talked about Sparkle, Waiting to Exhale and working on her new solo record. And she was excited for Clive [Davis'] party."

Meanwhile, TMZ reports that although Whitney's medical and pharmacy records are being subpoenaed there is no indication that her doctors did anything illegal.

About five or six doctors and some pharmacies will be required to give details of the drugs the I Will Always Love You star was prescribed. So far everyone contacted by the Coroner's Office has cooperated with the request.

Whitney will be laid to rest next to her father at a cemetery in New Jersey this Saturday following a private service just for family and friends.

The singer is survived by her 18-year-old daughter Bobbi Kristina Brown, mother Cissy Houston and cousin Dionne Warwick.