Olivia Newton-John, Cliff Richard - Suddenly (LaRCS, by DcsabaS, 2015)

"LaRCS" stands for "Live and Record Combined Stereo", which means that on the left side you can hear a live performance, while on the right side the video clip/studio version. In this case you can enjoy a classic duet by Olivia Newton-John and Cliff Richard: on the right side you can see the official music video clip, while on the left side a beautiful live version from 2015 (transposed and tempo adjusted).