AIFF
Audio Interchange File Format — Apple's 1988 uncompressed audio format, the Mac's answer to WAV before WAV existed.
AIFF is built directly on Electronic Arts' IFF and, like the Motorola 68000 chips in the Macintoshes of the day, it is big-endian. The content is almost always PCM, organised in chunks much like WAV: a COMM chunk for channels, bit depth and sample rate, and an SSND chunk for the sound itself. Oddly, the sample rate is stored as an 80-bit floating-point number.
The AIFF-C variant allowed compression, and in a nice twist its most common "codec" became sowt — uncompressed audio with the bytes swapped, i.e. little-endian. In practice AIFF and WAV are interchangeable, and which one a studio uses says more about the platform it started on than about sound quality.