On occasion our engineering team may ask you to provide a track time log. This is done in cases where the you have supplied a single audio file for Side A, and one for Side B. While it is totally fine for you to supply audio this way, we still need to know where each song begins and ends so that the track bands can be placed on the record. Track Bands are the visual breaks between songs on the surface of the record. While they look like gaps in the grooves, they are actually just areas where the grooves are spaced widely. It is possible to have continuous unbroken audio play through a track band.