Literally 'score-write'. The musical sense ('compose') is the original; the figurative sense — 'pen a chapter of history', 'write a new page' — is extremely common in news writing, speeches, and propaganda. If the object is
乐曲/
歌曲/
旋律 it's literal; if it's
篇章/
故事/
历史/
新篇 it's the lofty figurative use.
