The phrase "ominous music" refers to music that sounds dark, eerie, or unsettling, and creates a feeling of impending danger or something bad about to happen. Full definition
They cherry picked key phrases from the e-mails and published them out of context, like a black - and - white political attack ad with ominous music. (edition.cnn.com)
In spite of the logic behind this policy, I could hear faint strains of ominous music playing in my mental soundtrack as I listened to the president unfold his plan. (firstthings.com)
Once it was all finished, I got the call... cue ominous music! (windgatelane.com)