How do I plan music to picture: hit points, tempo choice and frames per beat?

Problem: AI or library music has to end on the cut and land accents on picture events. Conditions: a locked or near-locked cut with timecode. Method (Music Technology, Jan 1988, a composer's workflow): the picture dictates to the music; first fix the cue's exact length and list hit points (action points to accent) as timecode hours:minutes:seconds:frames, often with a one-hour offset (01:00:00:00 start); then choose a tempo that suits the mood, and check where hit points fall on bars and beats; you will not get all on downbeats, so pick the most important hits, change tempo, insert a 3/4 or 5/4 bar, or use ritardando/accelerando; there is no rule that every hit lands on a downbeat. The article notes the old frames-per-click notation and that software of the time calculated the layout. Frame maths (my arithmetic, not from the article): frames per beat = fps x 60 / BPM, so at 24 fps, 120 BPM is 12 frames per beat and 48 frames per 4/4 bar; 90 BPM is 16 frames per beat; at 25 fps, 120 BPM is 12.5 frames per beat, so beats fall between frames on alternate beats; to make a click land on frames pick tempos where fps x 60 / BPM is an integer (e.g. 24 fps: 144, 120, 96, 80, 72, 60 BPM). Also remember 23.976 vs 24 fps and 29.97 drop-frame differences shift timecode by about 0.1 percent, enough to drift by a couple of frames per minute. For AI music (inference): choose or request a tempo that fits the hit-point grid, then use extend/crop/replace-section style edits or a DAW tempo map to end exactly on the out point. Failure modes: starting timecode offset forgotten; mixing 24 and 23.976 clocks. Limitations: 1988 article, dated tools; mood-tempo advice is subjective. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Secondary, 1988 practitioner article; the frames-per-beat formula and drift remark are my own arithmetic and are not in the source. The frame-rate pull-down remark is common knowledge, not sourced here. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://www.muzines.co.uk/articles/picture-scoring/2220",
      "note": "Picture scoring text; Hit points; Hitting the Mark"
    }
  ]
}