To be honest, I would rather you have a separate playback system for music playback. Like I said earlier, ipods and other mp3 players are almost foolproof, and less of hassle to set up. All you need is to connect them to the tape input of your mixer and you're done. Laptops are a bit worrisome for me because their power supply bricks have a nasty tendency to be noisy, considering we don't use properly grounded systems here. And even then, laptop psu's typically use 2-prong plugs instead of grounded 3-prong systems, plus the power bricks are usually switching power supplies which have a nasty habit of adding electrical noise to your audio.
Then you have to add a proper sound interface for the laptop during recording because the built-in sound just won't do, unless you're just intent on making demos. USB3 is a nice option, but there aren't any USB3 interfaces in the market just yet... maybe next year(s) when the standard is adopted by soundcard manufacturers.
