A manuscript of a symphony kept on the bookshelves of a library is like a great painting hidden away in a museum where no one can see it. Music needs to be performed to be appreciated and embedded into a culture. The work of a composer must be made accurately easily accessible to musicians and the public for the work to be widely disseminated. This critical edition marks an effort in this direction to shed light on a major work of Mexican composer José Francisco Vásquez Cano (1896-1961).José F. Vásquez was one of the most prolific Mexican composers and accomplished conductors in the first half of the 20th century, yet there is little widespread knowledge about his life and works. This critical edition of the first movement of Symphony No. 2 (1929) will create a path to further performances and recordings, so that future generations in Mexico and abroad can acquire a wider appreciation of this composer’s role in the wider Mexican cultural heritage. This edition aims to show with transparency every critical decision made based on the score’s manuscript and presently available set of instrumental parts. Due to the continued efforts of José J. Vásquez (the composer’s son) to promote the recovery and performance of his father’s music, I have had access to a black and white scan of the full score’s manuscript, and high-definition color scans of 29 parts for each instrument, allowing me to accurately pinpoint possible errata in the manuscript. The critical commentary along with the digitized score aim to offer future conductors and performers access and insight into this important work by an invaluable composer.