tl;dr: "Gridification" is the post-production practice of quantizing recorded human performances to a machine-perfect timing grid, a technique the author's tempo analysis shows is near-universal in today's pop hits but absent in 1975's. The Musical Form Institute argues this erases the "felt time" and historical presence of the performers, and has launched a "Certificate of Embodied Production" to certify recordings that preserve unquantized human timing.