| (1) | We have to study the hundreds of 
		chant manuscripts first as witnesses of a musical life differentiated in time and space. 
		In a logical sense it is only as a second step that they can be used as starting points 
		from which to reach backwards to the initial "one form" 
		(or several forms) of this heritage... See more | 
	| (2) | The difficulty lies in the fact that 
		the whole source material is almost exclusively a product of the third epoch and that 
		this treasury preserved and integrated the heritage of the first and second periods too. 
		Thus if we want to make a statement about any feature of the first or second epoch, 
		we have to rely on arguments taken from the third one... See more | 
	| (3) | How can we decide whether a 
		given peculiarity is a function of the time or a local constituent existing perhaps 
		simultaneously with the manuscript analysed, documented, however, only from centuries later? [...]
		Might it not be that the late sources preserve those traditions in 
		the light of which the early traditions may be interpreted?... See more | 
	| (4) | We may easily be a little bewildered, however, 
		on being faced with the vast number and variety of sources, when we want to approach them without 
		prejudice and with the intention of not excluding any groups of sources because of their age or origin.[...]
		It will, however, give us reassurance if we consider that, while the sources show only the face of the 
		past that is turned in our direction, they reflect a life hidden behind them, and each source 
		represents a particular tradition... See more | 
	| (5) | What we want to achieve when we inquire into the 
		'provenance' of a given source is, in the last analysis, the identification and localization of the 
		tradition influencing the source, at least with respect to the history of liturgy and plainchant. 
		'Provenance' means in this context the relationship between the above mentioned 
		consuetudo and the source itself... See more | 
	| (6) | ...we have to establish a proper method by which we may define the 
		liturgico-musical 'provenance' of the sources. We think that the concordance of many 
		sources makes this possible... See more | 
	| (7) | How can the above mentioned principles be 
		adapted for practical implementation? The first task is to gather the greatest possible number 
		of prospectively coherent sources that promise to be fruitful for typological 
		analysis... See more | 
	| (8) | ...we have to start our work with a period
		 - be it late or early - where we can safely draw up the outlines of a tradition from more 
		than one source. It is only then that we may begin our journey back into history and 
		ask whether this typology can throw light on other centuries too... See more | 
	| (9) | The liturgy 
		and its music are more than the sum of elements of equal rank. There are some 'strong' 
		points in the organism of the tradition while others are of less importance, subject to 
		changes. [...] The points characteristic of a given tradition appear at unforeseeable, seemingly 
		capricious points. [...] There is only one principle of typology to be 
		established beforehand, that the points of differentiation cannot be determined in advance... See more | 
	| (10) | When trying to identify the various 
		local traditions, we have to disregard the sources of the religious orders in the first 
		stage of research...[...] It is less the Mass than the Office that has provided primary material 
		for the distinction and comparison of local traditions. [...] The Pars Temporalis proves to be more expedient for 
		carrying out primary analyses than the Pars Sanctoralis... See more | 
	| (11) | [...] There exist, however, no sharp dividing 
		lines between the practical decisions changing from time to time and the assignments after they 
		have become fixed so as to form an organic part of the Office. Moreover, we know that 
		the liturgical order - the mirror of the identity of the community - and the more flexible 
		'consuetudes' are completed by a third layer in the manuscripts which go back to different
		redactional decisions... See more | 
	| (12) | The analysis of the sources may give 
		rise to the emergence of a 'typical tradition', a kind of ideal state which is naturally 
		not the same as the mixture of many sources. Hidden beneath this 'ideal' form you always 
		find the best source or group of sources and, of course, the living tradition itself... See more |