Can Keynote on iOS play PowerPoint files with audio? I have a family member who's considering buying an iPad. The biggest needs she has is to see PowerPoint presentations with music/audio.

She currently has an iMac with Microsoft Office installed, and thus she can read 99% of the PowerPoint ppt/pptx file. I fear that the iPad might not be able to play any presentation's music.

How can this be done on the iPad? If this requires an app to be purchased, that's OK.
I have recently just put a presentation together which had music and a video and it played the same as on the computer using Keynote. There is another app (which I have not used) which might work better and be the first thing to try (it's free): Slide Shark.