Matlab iir filter

My project is related to designing an iir filter in Matlab. When I was asked what type of filter design do I need, I chose Band-pass. Then I was asked if I have specific frequency requirements for the filter which I answered yes. I need this for Audio Processing. The main objective of this project is to design a filter in Matlab, with specific frequencies and in the band-pass format which will be used in Audio Processing. I am looking for an efficient and accurate filter design.