Objective: The purpose of the research was to examine and measure the singing accuracy, intonation, and quality of the singing voice of adult singers in community choirs; in addition, to identify voice production problems in community choir singers and explore ways to correct them. Another objective of the study was to explore the impact of structured warm-up exercises on the singing voices of amateur adult choir singers.

Methods: Members of two amateur adult community mixed choirs participated in the study, with a total of 80 community choir singers. Self-developed instruments were used to assess the accuracy, intonation, quality and singing voice problems of amateur adult choir singers. The research methods employed were rating scales and analysis of video recordings of singing. Data were analysed using qualitative and quantitative analysis protocols (Likert scale, descriptive statistics, Pearson correlation).

Results: The most common voice production problems among singers in the community choirs were compressed singing voice and singing exclusively in the chest register, but there were also quite a few singers who sang with an airy voice. Conscious, well-planned, warm-up and vocal exercises that take full account of the vocal development level and singing voice formation problems of choir members have a significantly positive effect on the singing accuracy, intonation, the quality of their singing voice, and the extent to which singing voice formation problems are corrected. It is important that the warm-up exercises follow each other in the order listed: posture improvement exercises, breathing exercises, diaphragm activation exercises, humming exercises, resonance development exercises, singing exercises to help develop consistent vowel and consonant pronunciation, staccato-legato exercises, singing voice range-expanding exercises, and polyphonic intonation exercises.

Conclusions: Correction of singing voice formation problems and the development of singing accuracy, intonation, and singing voice quality are closely linked. Choral warm-up has been shown to significantly improve various aspects of vocal performance and has led to measurable improvements in the singing abilities of community choir members. This advantage can be particularly valuable for community choirs, as they often consist of amateur singers who may lack formal training.