The following titles are downloadable as public domain titles, free of charge (some with learning tracks included):
Charley My Boy - BHS/HI Contestable Barbershop (SSAA): Sheet music and learning tracks
By the Old Ohio Shore - Polecat-like Barbershop (SATB): Sheet music and learning tracks
Love is Spoken Here - Non-contestable, Barbershop stye (religious, SSAB): Sheet music and learning tracks
His Eye is on the Sparrow - Non-contestable, Barbershop stye (religious, SATB): Sheet music and learning tracks
It is Well With My Soul (in three voicings) - Non-contestable, Barbershop stye (religious, a cappella)
SSAA (with learning tracks) - TTBB (with learning tracks) - SATB (with learning tracks)
My Shepherd Will Supply My Need - Choral (SATB, Piano): Sheet Music - Audio
He Lives and Loves - medley of I Know that My Redeemer Lives, and 'Tis Sweet to Sing His Matchless Love - Choral (SATB, Piano):
SATB sheet music - SATB audio Soprano-Tenor (two-part duet) sheet music - ST Duet audio