Karaoke Queue Manager is very handy for those that use Youtube or pull from multiple sources and have access to any song but just want an app to manage the queue. It basically maintains a queue without having an online catalog for singers to browse. The KJ can add the song manually as well if someone doesn't have a mobile device. It also has a feature that forces singers to be in the club when submittng their songs by phone that's called wifi constraint. See link below this video