A crowd-pleaser is something or someone who pleases the crowd (crowd=audience).

معناها أنها تروق للذوق العام A person, spectacle, work, or idea that appeals to popular taste. يعني تعجب عامة الناس

I'm not really sure about the context of this question, or better said how "crowd pleaser" fits into it, but in general, something that is a crowd pleaser is something that is liked or enjoyed by lots of people. That song is a crowd pleaser is very common for example.