Adult contemporary is heavy on <answer>romantic sentimental ballads</answer> which mostly use acoustic instruments (though bass guitar is usually used) such as acoustic 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 type of song is frequently seen in the adult contemporary genre?
romantic sentimental ballads