Background: Stefanie Graf was born on 14 June 1969, in Mannheim, Baden-Wurttemberg, West Germany, to Heidi Schalk and Peter Graf (18 June 1938 - 30 November 2013), a car and insurance salesman. When she was nine years old her family moved to the neighbouring town of Bruhl. She has a younger brother Michael. Graf was introduced to tennis by her father, an aspiring tennis coach, who taught his three-year-old daughter how to swing a wooden racket in the family's living room.
Context: In late 1999 and early 2000, as part of her Farewell Tour, Graf played a series of exhibition matches against former rivals in New Zealand, Japan, Spain, Germany and South Africa. She played Jelena Dokic in Christchurch, New Zealand, Amanda Coetzer in Durban, South Africa, and her former rival Arantxa Sanchez Vicario in Zaragoza, Spain. It was Graf and Sanchez Vicario's first head-to-head meeting since 1996. In February 2000, Graf played against Kimiko Date at Nagoya Rainbow Hall in Tokyo, winning in three sets. In September 2004, Graf dispatched her former doubles partner Gabriela Sabatini in straight sets, in an exhibition match played in Berlin, Germany. She was also in Berlin to host a charity gala, as well as inaugurating a tennis stadium renamed the "Steffi Graf Stadion". Proceeds from her match against Sabatini went to Graf's foundation, "Children for Tomorrow". In July 2005, Graf competed in one tie of World Team Tennis (WTT) on the Houston Wranglers team. She was beaten in two out of three matches, with each match being one set. Graf lost her singles match to Elena Likhovtseva 5-4. She teamed with Ansley Cargill in women's doubles against Anna Kournikova and Likhovtseva but lost 5-2. She was successful, however, in the mixed doubles match. Graf completely ruled out a return to professional tennis. In October, Graf defeated Sabatini in an exhibition match in Mannheim, Germany, winning both of their sets. Like the exhibition match the previous year against Sabatini, proceeds went to "Children for Tomorrow". In 2008 Graf lost an exhibition match against Kimiko Date at Ariake Colosseum in Tokyo. As part of the event, billed as "Dream Match 2008", she defeated Martina Navratilova in a one-set affair 8-7, with Graf winning a tiebreaker 10-5. It was the first time in 14 years Graf had played Navratilova. Graf played a singles exhibition match against Kim Clijsters and a mixed doubles exhibition alongside husband Andre Agassi against Tim Henman and Clijsters as part of a test event and celebration for the newly installed roof over Wimbledon's Centre Court in 2009. She lost a lengthy one-set singles match to Clijsters and also the mixed doubles. In 2010, Graf participated in the WTT Smash Hits exhibition in Washington, D.C. to support the Elton John AIDS Foundation. She and Agassi, her husband, were on Team Elton John, which competed against Team Billie Jean King. Graf played in the celebrity doubles, women's doubles, and mixed doubles before straining her left calf muscle and being replaced by Anna Kournikova.
Question: Did she play for charity during her exhibition career?
Answer: Proceeds from her match against Sabatini went to Graf's foundation, "Children for Tomorrow".

Background: Dennis Coles (born May 9, 1970), better known by his stage name Ghostface Killah, is an American rapper and member of the Wu-Tang Clan. After the group achieved breakthrough success in the aftermath of Enter the Wu-Tang (36 Chambers), the members went on to pursue solo careers to varying levels of success. Ghostface Killah debuted his solo-career with Ironman in 1996, which was well received by music critics. He has continued his success over the following years with critically acclaimed albums such as Supreme Clientele (2000) and Fishscale (2006).
Context: A roommate of Wu-Tang founder RZA, Ghostface helped bring together the other seven members. In 1995, Ghostface guest-starred extensively on fellow Clan member Raekwon's debut album, Only Built 4 Cuban Linx..., appearing on almost every song and receiving nearly equal billing. He also contributed songs to the Sunset Park and Don't Be a Menace to South Central While Drinking Your Juice in the Hood soundtracks, which would be included on his first solo LP, Ironman, in 1996. The album, which debuted at #2 on the Billboard 200, had a more pronounced soul influence (particularly 1970s soul) than previous Wu-Tang releases, and Ghostface's future albums would continue to feature this stylistic trait. In 2000, he released his second studio album Supreme Clientele. The album was well received by critics and peaked #7 on the Billboard 200. It included "Apollo Kids", a popular single which featured Raekwon and had a sample of "Cool Breeze" by Solomon Burke. "Cherchez LaGhost", another single off the album, became a minor club hit. Supreme Clientele would be a turning point in RZA's influence on his sound, as only six songs are produced by the RZA, compared to Ironman, its predecessor where every song but one is produced by him. Though he contributed fewer beats to the project, RZA personally oversaw the mixing and production of the album as a whole, contributing to Supreme Clientele's unified sound. Ghostface wasted little time in recording his next album, the heavily R&B-influenced Bulletproof Wallets, released a year after Supreme Clientele. Its feature single, "Never Be the Same Again", featured Carl Thomas and Raekwon. He had another minor club hit with "Flowers", which featured guest vocals from fellow Wu-Tang members Method Man and Raekwon, and a popular single "Ghost Showers" which featured Madame Majestic, who also sung on the popular Wu-Tang track "Gravel Pit".
Question: Did he feature any other artists in any of his albums?
Answer:
Raekwon