Here are three preview tracks from the soundtrack of Rainbow Six: Siege, by Paul Haslinger -

https://mega.nz/#!uwYBhSxB!QjHGil1BD9c18CMdDVgGHlNjX5Nw2hcjrb7qBvcAGtM

You can also find these tracks on Paul's website -
Rainbow Six | Siege | Paul Haslinger (http://www.haslinger.com/project/rainbow-six-siege/)