Sound is another concept that impacts on a student learning. On a daily basis the classroom encounters many amounts and different types of noise and can range from: classroom discussions, background noise, conversations and music. Nevertheless Marsh (2008) states that "sounds are all around us, however when sounds are unwanted they are redeemed as noise". In order to learn students are subjected to conversations throughout their day, if not by the teacher, but themselves and other peers. The level of variable noise will alter depending on settings such as the difference between libraries to art classes. Every classroom has background noise such as fans, ventilation, discussions and conversations which is measure in decibels as BNL (Background noise levels). Marsh (2008). A teacher can communicate clearly in a quiet voice when the BNL rises to 35dB, providing a safe and comfortable atmosphere. A normal voice will carry well over a BNL of 40dB where learning takes its peak as information and instructions can be delivered and heard clearly. Opposed to anything over 45dB or 50 dB where a teacher or student must speak very loudly which in return can cause distraction, irritation, stress and fatigue (Marsh, 2008). Due to the circumstances of being subjected to a variety of different levels of noise within a classroom, students can alter between efficient learning and digression. This clearly outlines the importance of noise level in the classroom and its effects on education.