Err... if you have the CD soundtrack for Samorost 2 then yes you should be able to put the tracks/songs on your computer's hard drive (so you don't have to insert the disc every time). Just use a CD ripper (software) like iTunes, Windows Media Player etc.
(more info on CD rippers here -
http://en.wikipedia.org/wiki/CD_ripper)
If you want to play the game without inserting the CD you can do one of two things:
1 - See if it comes with a code for a digital download (such as via Steam) and if so download and play it using that.
or
2 - Make a virtual copy of the game's disc to keep on your computer's hard drive and use a virtual drive software to play it.
A good software for making virtual copies of discs is CloneCD (
http://www.slysoft.com/en/clonecd.html)
...and a good software for playing virtual discs is Virtual CloneDrive (
http://www.slysoft.com/en/virtual-clonedrive.html)