How do intros, outros and AABA bridges constrain how I start, end or loop a generated song under picture?

Problem. Starting mid-song or looping the ending creates abrupt openings and false closures. Conditions. Pop/rock; AABA (32-bar) or verse-chorus. Method. OMT: introductions move from silence to the first core section, are short and usually instrumental, and often build by layering one instrument at a time; outros take the song back to silence and so decrease energy, often via fadeout, and normally reuse material from the last core section or from the intro (a 'bookend'); a coda adds new material after the final chorus. In AABA, the bridge contrasts and withholds the strophe, builds expectation and arrives on dominant harmony to prepare the return, so cutting the bridge but keeping the return can feel unprepared. Inference for editing: build a custom start from the intro layering order; build an ending by jumping from a chorus to the outro rather than looping the last chorus; keep the bridge-to-return pair intact. Failure modes: fadeouts cannot be reproduced when a hit must land on a final beat. Limitations. Examples are 1960s-80s rock; modern electronic structures may differ. Version/date. OMT 2e, Aug 2025. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Corpus is classic rock/pop; the editing recipes are my inference and untested on AI-generated tracks. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://human.libretexts.org/Bookshelves/Music/Music_Theory/Open_Music_Theory_2e_(Gotham_et_al.)/07%3A_Popular_Music/7.05%3A_AABA_Form_and_Strophic_Form",
      "note": "Introduction; Outro; Bridge (B); Introduction/Outro"
    }
  ]
}