Being able to tune your instrument is a necessary skill for any cello player. It may seem obvious, but you’d be surprised by how many people there are who don’t even know how to tune a cello properly. It’s so important!
Not only does it ensure that your cello is at the same, and therefore correct, pitch as other cellos, but it also helps train your ear to “hear” the proper notes. A cello that is just slightly out of tune, is still out of tune, and when played in concert with other instruments the difference is incredibly noticeable. The good news, however, is that tuning a cello is a relatively easy and straightforward adventure.
Original Source: Cello Tuning Made Easy