Smule doesn't seem to be a karaoke app even though it advertises itself as one. Two reasons, first there aren't any backing or lead tracks & even though there is a "sing with the artist" filter, the filter doesn't actually give you the songs to "join" to sing with the artist, second there is no way to change the pitch, which is essential for good karaoke. I won't be sticking around after the 7 day trial. Some of the other features are cool but the two core features missing are a non starter.