“…Over time, these two elements improve, be it in teachers' formal education or in their teaching training. However, content becomes a key aspect in these current years (Darling-Hammond & Bransford, 2007;Epstein, 2018;Grossman et al, 2009;Stronge et al, 2011;Walshaw & Anthony, 2008), in accordance with Townsend (2011); Augustine & Wong (2016); Maguraushe (2015); Concina (2015); Rauduvaitė & Wang (2018) who claim that content and method mastery play a serious role in operative coaching, serving as a solid basis for music educators' instructions .Other researchers view capability as a basic characteristic of an individual, including information, abilities, and attitudes connected to the work employed ( Issenberg et al, 2005;Frese et al, 1997;Luthans, 2002;Spencer & Spencer, 2008). It plays an instrumental role in the success of doing work activities (Kolibáčová, 2014;Siri et al, 2020).…”