In 2004, McKhool co-founded the innovative world music collective Sultans of String,[7] with Kevin Laliberté and Drew Birston, releasing nine albums and winning multiple awards.
[13] Special guests included Richard Bona, Paddy Moloney (The Chieftains), Nikki Yanofsky, Ruben Blades, Sweet Honey in the Rock, Alex Cuba, as well as the City of Prague Philharmonic Orchestra.
Entitled "Refuge", it features many special guests who are refugees and recent immigrants to Canada and USA, as well as global ambassador's for peace, showcasing their extraordinary contributions to society.
For Refuge, McKhool and Bailey travelled from Canadian First Nations land to Toronto, New York, and Istanbul, Turkey to craft the sound of an album spanning many cultures, collaborating with artists as diverse as Béla Fleck, Yasmin Levy, and Turkish string ensemble Gundem Yayli Grubu.
McKhool has also worked with other notable recording engineers including Jeremy Darby (Live Aid, U2, Pink Floyd, Prince), George Seara (Jesse Cook, Michael Jackson, Sting) and Nik Tjelios (Ken Whiteley, Pete Seeger) As a guest violin player, McKhool has also recorded and performed with several world, folk and jazz performers including Jesse Cook, Amanda Martinez, Pavlo, Club Django, Mike Ford, and Emm Gryner.
McKhool has also enjoyed a successful career performing for young audiences, appearing on television shows such as Mr. Dressup, YTV's Treehouse, TVOntario's Crawlspace and the CBC, as well as concerts across Canada.
[17] He has toured throughout Canada, including Baffin Island, as well as performing across the U.K. the United States, Indonesia, Cuba, Guatemala, Peru and Tibetan schools across the Indian Himalayas.