I have been to some Protestant churches that have a liturgy on Sunday mornings (Lutherans, Presbyterians, etc) but most of the churches I've attended do not (Baptist, Assembly of God, etc). By liturgy, I mean specific readings, usually chosen according to a church calendar, from a pool of shared, historical literature compiled by the church over time.
When and why did Protestants who follow the 'sing a few songs and then listen to the Pastor give a sermon' tradition abandon the liturgy in favor of worship music followed by a sermon? I am not asking about praying the hours throughout the day but rather about the church service.