 There is a strong keyboard presence, in the 1960s especially, using electronic organs, harpsichords, or the Mellotron, an early tape-driven 'sampler' keyboard.Elaborate studio effects are often used, such as backwards tapes, panning the music from one side to another of the stereo track, using the "swooshing" sound of electronic phasing, long delay loops and extreme reverb.In the 1960s there was a use of electronic instruments such as early synthesizers and the theremin.