The arithmetic of a songwriting floor
Staff writers, a quota, and a publisher taking the copyright — the system that produced most of the era's hits.

How Brill Building publishing turned a song into a contract obligation
The offices above and around 1650 Broadway ↗ in the early 1960s ran on a piece-rate logic that the music business had borrowed from manufacturing. A staff writer came in, sat at an upright piano in a small room, and wrote. The publisher owned what came out. That was the deal.
Gerry Goffin and Carole King were among the cleaner examples of how the arrangement worked. They signed to Aldon Music, the publishing firm Don Kirshner and Al Nevins operated out of 1650 Broadway, drew a weekly salary against future royalties, and were expected to produce. Aldon took the copyright on everything written on company time. The writers kept a writer's share of the mechanical and performance royalties — roughly half of whatever the song earned — but the publisher's half, and crucially the ownership of the copyright itself, stayed with the firm.
The quota was informal but real. Kirshner ran a competitive floor; writers knew what their neighbours were turning out. A song that didn't place within a reasonable time was shelved and another started. Volume was the point: write enough and the law of large numbers meant some would land. Matching a finished song to an artist was a separate job, handled by the publisher's song pluggers, which is how the pipeline kept moving without any single person carrying the whole process.
Kirshner ran a competitive floor; writers knew what their neighbours were turning out.
What the publisher gained was leverage. Owning the copyright meant collecting the mechanical rate — set by statute — every time a record was pressed, regardless of how many copies the artist saw money from. A number-one single pressed in the hundreds of thousands generated mechanical income that went straight to the publisher's account, not through the artist's royalty statement.
For the Shirelles, this meant "Will You Love Me Tomorrow ↗" earned Goffin, King and their publisher on a scale the group itself could not immediately access. The song was an asset the moment it was registered; the record was almost a delivery mechanism. The Copyright Act's compulsory mechanical licensing provision made the arithmetic predictable from the first pressing. Everyone on the publishing side knew the number before the record shipped.

