As outlined by various researchers (Phelps et al 2005; Gall et al 2007; Phillips 2007), providing creditability and reliability of research methods will promote strength of data findings as well as strengthen the application of findings to other music research.
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Gall, M. D., Gall, J. P. & Borg, W. R. (2006). Educational research: an introduction (8th edition). Boston: Allyn & Bacon.
Phelps, Roger, Sadoff, Ronald H., Warburton, Edward C. and Ferrara, Lawrence. (2005). A Guide to Research in Music Education. 5th ed. Lanham, MD: Scarecrow Press, Inc.
Phillips, K. H. (2008). Exploring research in music education and music therapy. New York: Oxford University Press.