The vocal performance is based on a variety of colours and shades influenced by the musical ear and vocal apparatus development. The research aim is to apply a problem-based approach to online music education with a special emphasis on vocal singing with piano accompaniment. The scholars used the oscillation coefficient to identify the main advantages of the singing and piano accompaniment performed at the same time. The results showed that the proposed approach to music performance influenced the development of the musical ear (0.22), improved vocal skills and piano playing skills (0.19). The musician's individuality has not been influenced greatly but holds all the elements mentioned above. The research developed a specialised training programme with three modules for online musical and theoretical training, the development of practical skills, and the development of artistic skills. The research found that 83% of students admitted high effectiveness of the training programme for concert performances and musical competitions. The research's practical significance can be explained by the possibility of developing vocal and instrumental data during the online learning process. The research is important for a comparative analysis to identify the training effectiveness among different groups of vocalists.