ðɪ ɐtˈɛndəns ʌv ˈiːtʃ ɑːnsˈɑːmbəl ɪz pɹaɪmˈɛɹᵻli bˈeɪst ˌɔn ˈeɪdʒ ʌvðə stˈuːdənt, ɔːlðˈoʊ ðɛɹ ɪz sˌʌm ˌoʊvɚlˈæp bˈeɪst ˌɔn ˈiːtʃ stˈuːdənts ɐtʃˈiːvmənt ænd lˈɛŋθ ʌv tˈaɪm ɪnðɪ ˌɔːɹɡɐnᵻzˈeɪʃən.
The attendance of each ensemble is primarily based on age of the student, although there is some overlap based on each student's achievement and length of time in the organization.