Ambrose Weems was the author of a book on music. When the Maestro planned crimes based on musical pices, Weems offered his services to Commissioner Gordon. Batman realized the potential for Weems' expertise, and decided to take him along. Weems donned the costume of the Sparrow to avoid suspicion. After the Maestro was apprehended, Weems retired his superhero career.

  • This version of Ambrose Weems (Earth-One), including all history and corresponding appearances, was initially erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. However the ending of Convergence retroactively prevented that collapse, saving all the alternate realities, though in an "evolved" form. Even though versions of the character may have since appeared, this information does not apply to those versions.