When considering the minimal acting training incorporated into most voice performance programs, it is understandable why many singers struggle to balance vocal demands with acting demands. Furthermore, the expectations on singers to deliver authentic and nuanced performances are increasing as opera evolves. Yet, there is little in-depth understanding of classical singers’ experiences with applying specific acting techniques to their singing. There is also little information about how different acting methods may affect classical singing. The purpose of this mixed methods, collective case study was to identify the impact of a specific acting method on classical singing, focusing on the learning experiences of singers being trained in an acting method, Chekhov or Meisner, and on the outcomes of that training. The qualitative strand focused on the personal experiences of two groups of singers who received training in either Chekhov or Meisner acting methods. In addition, survey and acoustic data provided further details on perceived quality of performance when specific acting training was applied. Self-efficacy theory provided a guiding framework for both the instructional design and qualitative analysis. Observations, interviews, and journal entries were used to identify qualitative themes related to the singers’ learning and artistic experiences. For both acting methods, a survey of the pre- and post-training video recordings of the singers’ performances was sent to professional voice teachers and directors. In addition, acoustic analysis was completed on pre- and post-recordings to look for trends in parameters associated with voice quality and expression (HNR, SPR, scooped onset, and vibrato). Survey and acoustic data did not show either method to have a strong impact on the vocal output; however, both data sources showed small, positive trends. Acoustic data supported that singers who improved in multiple parameters were generally rated higher by survey respondents. Cross-case analysis revealed that both acting methods contributed to increased self-efficacy, which positively influenced the singers’ confidence and motivation. Neither acting method proved detrimental to vocal quality, and both contributed to increased confidence among singers—an important consideration for voice pedagogy. These findings point to the broader pedagogical value of integrating acting methods into singer training. Voice teachers can meaningfully enhance students’ performance and confidence by integrating structured acting techniques, even without formal certification—offering a more accessible, holistic, and motivational alternative to traditional master-apprentice models.