The ZKP Library and Music Library since 1945, then the Center for the Documentation of Polish Contemporary Music since 1998, and finally the Polish Music Information Center POLMIC has been documenting Polish music since 2001. We have built and maintain the largest database of contemporary Polish composers and their works (from the second half of the 20th century) "New Polish Music". In the mid-1990s, the process of converting analogue data - index cards and lists - into digital formats began. Currently, the database contains descriptions of over 50,000 works by Polish composers and links to entries about them in the POLMIC Encyclopedia of Music.