I'm pleased to present to you, courtesy of the Church Music Association of America, what many consider to be the finest single book on the problem of liturgical transformation and transition between the old and new forms of the Roman Rite. It is Laszlo Dobszay's The Bugnini-Liturgy and the Reform of the Reform. This was published in 2003, and full anticipates the present moment.
To pre-answer the inevitable question: yes, a new print edition is coming.