First released as Professional Composer among early Macintosh software in 1984, the application introduced a user interface similar to the word processor.
Version 2.0 also introduced several improvements for printing (such as automatically condensing parts with several rest measures), allowing production of professional quality scores.
Although the application demanded knowledge of music theory to use its rich features, it offered only rudimentary playback capabilities.
[9] Drag and drop features and ability to convert MIDI files into usable notation were counted among the strongest points of Mosaic.
Competing notation packages are Sibelius, Finale, and Dorico, however no direct conversion of file formats, such as via MusicXML, is possible.