Music is an essential part in the children's world. It helps lowering the affective filter and thus will learn more effectively. However, the subject is still English and not singing, so the principles of English Teaching for Young Learners are still applied.
The song should be in accordance with the objective, and used as a means of English Teaching, involving a balance VAK (visual, auditory and kinesthetic), and considering the students' short time span.
With this approach, there is no reasons for the teachers not to use songs in the children classroom. Plenty of materials are available online, CDs are available in abundance. So?
