In 1963, at age 21, Lang became a professional folksinger and worked initially at the Café André, a venue near the McGill University campus, for three years.

She quickly became a star on the Montreal folk scene, filling the club every night with a loyal returning audience drawn by her effective guitar-playing, throaty voice, and most of all by her astonishing ability to connect with the people she was singing to.

After an extended time away from professional life living in Morin Heights, a small village in the Laurentian Mountains where she raised her son Jason, she returned to full-time performing and was welcomed back to an adoring public.

She returned to the studio in 1989 and recorded nine well-received albums for the She-Wolf, Festival and Borealis labels and toured Australia, Italy, Denmark, France and the United Kingdom.

Penny shared a lifetime's familiarity with folk, blues, gospel and country songs with audiences and friends wherever she went and will be fondly remembered for her work on the concert stage.