The first major label LP release based on an all-digital mix was Ry Cooder's 'Bop till you drop' from 1979, and it sounds terribly brittle because of the primitive implementation of digital technology at the time. It took some time for recording engineers to come to grips with this new stuff, which is why most studios continued to record on analog tapes right through the 80s, or made two sets of recordings, one analog and one digital, for the LP and CD release. Since the late 80s, most recordings have been all digital, and so the LPs released since then come from digital masters, as also many reissues of pre-80s material. The exceptions are those that specifically mention ' mastered from the original master tapes' like the recent Beatles Mono box set, or many of the Acoustic Sounds and Analogue Productions reissues. Some boutique labels even today release LPs that have an all-analog recording and mastering chain.