Between 1990 and 2001, László Lajtha's niece, Ildikó Lajtha, an economist, endeavoured to present Lajtha's original bequest. She collected documents on Lajtha, and organized several exhibitions, concerts, etc. Understanding that the heritage of an international composer and ethnomusicologist should be available for research, she offered it to the Hungarian Heritage House in 2001. In 2013, Lajtha's bequest was divided, with his folk music collection remaining at the Heritage House, and his legacy of works as a composer going to the Institute for Musicology. Ildikó Lajtha died in 2013. During her life she supported every proposal concerning the bequest of László Lajtha.