How important is bitrate in music

What is bitrate?

Bitrate is the number of bits per second encoded in a file. Thus, the higher the bitrate the more information is retained and vice versa.

Why is this important?

Generally, the lower the bitrate, the lower quality of sound. Lower quality means you have a smaller frequency range in your song (high frequencies drop off with lower kbps). This equates to playing a song say in a club, it would sound like it was recorded with a potato as opposed to a professional studio. It's like a low-resolution image compared to 4K.

Bitrates in different audio formats

Songs on your music streaming services are usually encoded in 128-320kbps files in various formats. Music bought from iTunes is encoded as 256kbps AAC. And music from Beatport can be 320kbps MP3 codecs or WAV/AIFF files. Confused yet? Bring in the potatoes.

MP3 (MPEG-1 Audio Layer 3) would be the potato you find in fast food fries. It's cheap, tasty and everywhere. It's a lossy format, as in to reduce the original audio file significantly it had to be compressed losing audio information. That's why MP3 is a cheap potato, and also a dying format.

AAC (Advanced Audio Codec) would be the slightly better potato that is replacing the MP3. It's like the chips you find at the hipster pubs with aioli. It's also a lossy format. You will find AAC music will have ".m4a" or "AAC" file extensions. Make sure you check that your DJ equipment accepts AAC (most new ones do anyway).

WAV (Waveform Audio File) and AIFF (Audio Interchange File Format) are both uncompressed audio files (lossless format) as they retain all audio information. These are the original potatoes, still fresh and unpeeled; and are usually over 100MB. These are what producers are working with until the files need to be mastered and dithered.