I've heard this too and thought it was brilliant. So James Cameron even repeated this and added constraints on the music with the second movie James Horner

I've heard this too and thought it was brilliant. So James Cameron even repeated this and added constraints on the music with the second movie James Horner thought he’d have six weeks to write the musical score. Instead, he had three weeks, and had to write some parts overnight. The movie was behind schedule, not even finished being filmed (let alone edited) when Horner arrived in England. What’s more, the recording studio he’d been provided with was outmoded, not equipped to handle the synthesizers he wanted to use. Horner called the experience a “nightmare,” and ended up writing the climactic musical cue overnight. Coming away with the impression that a James Cameron film was too stressful and rushed, he figured he’d never work with the director again. And he didn’t ... until Cameron approached him for Titanic. (That rushed Aliens score earned Horner an Oscar nomination, by the way.) It seems like there's a Machiavellian lesson there. There's a lot of great "making of" material on Aliens, which shows James Cameron being a genius on other aspects too.