The Architects of Lean Bass ☓ When whispers of their name first emerged early in 2016, it caught the attention of many. This mysterious duo materialized out of a murky cloud of intrigue, establishing themselves as trendsetters in electronic music. After a chance meeting, Jeff Willson and Justin MacLean started collaborating on production not knowing what would soon come of it. While both have a long history as solo producers and prolific live solo performers, working in a partnership was something neither had done before.