how do you list 2 variable in a row?

I want to do this with itunes:
play playlist “library”

but, I want to make both term variable
this does not work…any ideas?

tell app "itunes"
set source1 to "playlist" as string
set name 1 to "library" as string
play source1 name1
end tell

doc:

You need to set the whole structure to a variable, like so:

tell application "iTunes"
	set play01 to playlist "library"
	play play01
end tell

This works for any playlist you want:

tell application "iTunes"
	set play01 to first library playlist
	set play02 to playlist "Television"
	set play03 to playlist "library"
	play play01
end tell

Go crazy.

thanks!