4 Lycke and Siupsinskiene acquired VRPs from both females enrolled in singing lessons (N=162) and non-singing females (N=67). Further, they suggested that the uncertainty around voice classification among teachers and students could represent a potential risk due to a lack of awareness which could in turn cause students to exceed the physiological limits of their voices. Finding no consensus on the need for voice classification, they instead found that when voice classification was practiced, no standard criteria were used to establish those classifications. Lycke, Decoster, and De Jong investigated voice classification practices among conservatory-based classical and musical theatre voice teachers. ![]() The use of VRPs could be helpful in choosing repertoire because teachers and students may not be adequately aware of students’ vocal capabilities and limits. The Voice Range Profile is a clinical voice assessment tool that measures the full range of a singer’s vocal intensity (in dB SPL) at each pitch in their vocal range ( Figure 1). 1 The idea was revisited and further explored by Titze, 2, 3 who suggested that the acquisition of singer Voice Range Profiles (VRPs) combined with the quantification of repertoire tessituras could help voice teachers scientifically choose repertoire that is a good “fit” for individual voices. The “tessiturogram,” a diagram of the distribution (number of occurrences or duration of time) of all pitches (measured by frequency in Hz) in a selection of vocal music, was first suggested in the late 1980s by Thurmer as an aid in the selection of vocal repertoire. Among these considerations, tessitura is a factor that could be quantified via computer in a systematic and repeatable way. During the repertoire selection process, teachers make observations about a selection’s range and tessitura, passaggio points, perceived vocal weight and color, and various other pedagogical goals that make that selection a good “fit” for a singer. Singing voice pedagogues use experience and anecdotal evidence when selecting appropriate repertoire for students. ![]() The following research questions guided this investigation: 1) How do Performance Range Profiles (PRPs, performance-based tessituragrams computed from neck skin surface vibration during singing), compare to score-based tessituragrams of the same selection in the same key? 2) How do PRPs of the same vocal score compare when performed in three different keys? 3) How do singer VRPs compare with PRPs of three performances of a score, each sung in a different key? and 4) How do singer and expert panel perceptions of the selection’s “fit” in three different keys compare with the alignment of each singer’s VRP to their PRPs? Four female singers and five expert voice pedagogues were enlisted to address these questions. ![]() The purpose of this study was to examine the combined use of tessituragrams, Voice Range Profiles (VRPs), a singer’s self-perception of a performance, and expert listeners perception of a performance towards the goal of a more systematic way of selecting appropriate voice repertoire for singers.
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