Soundcards are a PC thing. Your Mac is self-contained.
Are you unhappy with the sound you are getting? Which format are you using for the songs you have loaded from your own CDs? Remember that the songs you download from iTunes are lower resolution (I think...don't do much of it myself) than what you rip yourself if you are using Apple Lossless or .wav to rip CDs. If you are not using one of those formats, then start there to get better sound quality.
Congratulations on your imminent retirement and your new MacBook Pro.
Are you unhappy with the sound you are getting? Which format are you using for the songs you have loaded from your own CDs? Remember that the songs you download from iTunes are lower resolution (I think...don't do much of it myself) than what you rip yourself if you are using Apple Lossless or .wav to rip CDs. If you are not using one of those formats, then start there to get better sound quality.
Congratulations on your imminent retirement and your new MacBook Pro.