Singing education is an important segment of educating students--future preschool teachers at faculties of preschool teacher education. Singing is an elementary mode of children's music expression. The task of future preschool teachers is to gain knowledge and awareness about the importance and influence of singing on children's development. Because children learn through imitation, there is a strong effect to be found in the preschool teacher's singing which entails intonational stability, steady rhythm and text articulation. This research was founded on quasi-experimental method of pedagogic research and it examined the way in which various modes of learning influence the intonational and melodic abilities development and the voice range of the subjects. Female students of Faculty of Teacher Education in Zagreb-Department of Petrinja (N = 36) participated in the research which lasted two academic years (2012/2013 and 2013/2014). They were divided into two groups, experimental and control group. The research lasted fifteen-weeks. According to Mann Whitney U test results, we found statistically significant progress in intonational and melodic accuracy, and widening the voice range of the experimental group, in comparison with the control group. The research yielded the conclusion that singing activity through a certain time period, whether led by expert vocal instructions, or intuitive singing, leads to progress in intonational and melodic accuracy and widening the voice range.