13 Songs mastered for an album

I am currently mixing a 13 song album for a client and I've been looking around to find a mastering engineer to perfect my work. The album is not scheduled to be finished with the tracking and mixing stages until November, though songs will be getting finished along the way.Preferably, we ask that whoever makes a proposal be willing to master either one song, or at the least a snippet of one song, in order for us to get an idea of the sound we would be getting and to better decide who we would like to work with. Hope to hear from some of you soon. (Also if you have any input on the linked song, please provide it, I know the solo is a little loud but other than that we believe this may be the final mix before being mastered so let me know what would help make for the best master).