Adult contemporary is heavy on romantic sentimental ballads which mostly use <answer>acoustic</answer> instruments (though bass guitar is usually used) such as <answer>acoustic</answer> guitars, pianos, saxophones, and sometimes an orchestral set. The electric guitars are normally faint and high-pitched. However, recent adult contemporary music may usually feature synthesizers (and other electronics, such as drum machines).
What general type of instruments tend to be used in adult contemporary?
acoustic