Converting your MP3 files to AAC can prove to be quite useful, especially if you want to play music on Mac, as AAC is Apple's proprietary audio format. If you wish to convert your music library from MP3 to AAC, you may try one of the audio converters for Mac found on the list below.
Feel free to add any alternative to MP3 to AAC Converter for Mac that you know of.
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Can these apps convert to FLAC as well?