is an experienced musician who played in many Dutch bands since the 1960s. He collaborated with Pim Koopman in the Diesel band, which reached No. 25 on the American Billboard Hot 100 charts with the single "Sausalito Summernight". In 2003, female singer Cindy Oudshoorn joined Kayak for the Merlin album and tour, and she decided to stay. In 2005, Jan van Olffen joined Kayak as their bass player. He had previously worked with Sister Sledge amongst others, and played in the house band for many Dutch stage musicals. Monique van der Ster also joined the band briefly in 2005 as a vocalist. On 4 January 2008, the band released Coming Up for Air. That same day saw the start of their 35th anniversary tour. On 7 October 2008, they ended the tour at the Paradiso in Amsterdam. The concert was released on CD and DVD as The Anniversary Box in December 2008. In October 2009, the band embarked on a Dutch tour. According to Ton Scherpenzeel (on the band's website), after that tour, Kayak would no longer do the album-tour-album-tour cycle. They would probably keep on making new music though, as Scherpenzeel stated. But the sudden and unexpected death of Pim Koopman in November 2009 (halfway through the tour) made the future of the band uncertain. In May 2010, the band's website announced a tribute concert for Pim Koopman. The concert was held on 22 November at the Paradiso. It involved not only Kayak, but also some artists with whom Koopman had worked in the past. Some of the names that appeared on stage: Pussycat, Karen Maywood, Alides Hidding, José Hoebee and Michael Robinson. Okkie Huysdens (with whom Koopman formed The President) and Jeroen Engelbert (one of many members of Koopman's band Diesel) also performed. For the occasion, Kayak used Hans Voerman as an extra keyboard player. The drum stool was occupied by Hans Eijkenaar. After the concert, Kayak announced that Eijkenaar was the new drummer of Kayak. With Eijkenaar on drums, Kayak released their album Anywhere But Here in September 2011. After the Pim Koopman Tribute in 2010, drummer Hans Eijkenaar was asked to become a full member. Besides playing drums, he was also responsible for the mixing of the Kayak albums Anywhere But Here and Cleopatra – The Crown of Isis. Eijkenaar was not always available for Kayak concerts; Sjoerd Rutten was the drummer when he was unable