There is no doubt that by listening and hearing Gurbani Paath one can burn one's bad Karma and receive Khushi of Vaheguru and this way fulfill any unfulfilled tasks.
If Naam Abhyaas has been called Paarjaat, then singing of Gurbani too has been called Kaamdhen. So, either of them will fulfill one's wishes and burn bad Karma.
Dhan Gurbani!I can't ever forget Late Subedar Baghel Singh jee's Bachan about Gurbani, in his typical Paindoo accent:
ਓਇ ਗੁਰਬਾਣੀ ਤਾਂ ਸਾਡੀ ਮਾਂ ਐ ਮਾਂ। ਇਹਦੀ ਗੋਦ ਵਿਚ ਬੈਠ ਕੇ ਆਪਾਂ ਨਾਮ ਜਪਣਾ ਐ।So Bhai, Gurbani dee Mehma Agam hai. Gurbani Meethi Amrit dhaar hai. Koi Shaq nahi, ke ih sabh ichh pujaavanhaar hai.
Kulbir Singh