Converting FLAC Files

I have a very large hard drive full of FLAC and WMA files which for whatever (probably simple) reason can't be read or played on a MacBook I recently acquired--how do I convert the files so they're usable with the Mac?
Thanks in advance....
dBpoweramp and XLD are perhaps the most popular. XLD is free. Convert your files to aiff or alac. Keep in mind if you choose wav it doesn't support metadata like other formats.

The age-old wav vs flac debate has been raging for years now with strong proponents on both sides. Listen for yourself if you care to. While I respect Steve's viewpoint I don't agree with him and I assume he won't be the one listening to your system.
If you want metadata in your .wav files MP3TAG is a program that should help. It supports all common formats.