The motivation to participate in ensemble rehearsals may be influenced by the rehearsal environment. With the emergence of the virtual rehearsal environment, there is a need to gain a better understanding of how online rehearsals affect participation decisions. The purpose of this study was to determine the applicability of one theory of motivation, Self-Determination Theory, to older adults' decisions to participate or not participate in virtual rehearsals. Respondents (N = 49) included participants (n = 20) and nonparticipants (n = 29) who completed the Intrinsic Motivation Inventory (n.d.) and the "Modified Computer Self-Efficacy Scale" (Laver et al. 2012). Mann--Whitney U comparisons indicated that nonparticipants had significantly lower ratings on the Perceived Competence and Value/Usefulness subscales on the IMI, in addition to significantly lower feelings of self-efficacy on the MCSES. Overall, the results seem to support the use of Self-Determination Theory to explain differences in the decision of New Horizons band members to participate in online rehearsals. To encourage participation in virtual ensembles, there is need to confirm ensemble members are comfortable with the technology and understand the value and usefulness of the activity itself.