Currently the more mainstream cell phone / tablet K song software has "Migu love singing", "Heavenly Melody K song" these two, some people will also use the "singing bar", but the first two MTV accompaniment and so on the higher quality, the picture and accompaniment are more original, and the projection out can also realize the effect of the horizontal screen. The "Sing it" app is prone to whistling after opening, because it mainly uses headphones to record and sing, and is not suitable for external amplification sound. Projection audio previous buyers also encountered this problem, so it is not recommended.
The two apps, "Migu Love Sing" and "Heavenly K Song", come with an original/accompaniment switching button, so you can achieve the effect you want with just a tap.