Why did shakespeare choose to write this play in the meter of iambic pentameter?

First of all iambic pentameter is lyrical in nature and flows very easily making it easy to remember also its was a convention at the time within poetry (see Shakespear's sonnets) as well as plays. it is also less awkward then basis prose and sounds better this why many rap artist use this system today, remembering that Shakespeare in his day was not particularly highbrow  it makes sense why he chose to use iambic pentameter.