Playing to a click track is a great way to work on your tempo personally and as a band. OnSong has a built-in metronome that plays to the tempo you set for every song in your library. OnSong has both an audio and visual metronome to work in any scenario.
You can toggle and set the metronome from the Metronome Live Bar Button found in the Live Bar at the lower right corner of the OnSong user interface. You can also toggle the metronome using Foot Pedals.
Get the Song Started
Forgetting the tempo of a song can be catastrophic to the rest of the song. Play the metronome for a few measures and have it turn off automatically. You can do this with the Stop Metronome option in Settings » Live Settings » Metronome » Audio Settings » Behavior.
Click Track with In-Ear Monitors
Whatever you do, don't play your metronome on stage for everyone to hear! However, you could send the audio metronome from OnSong into your sound board or use a mix-in channel on your in-ear monitoring system. With this configuration, you will hear the click and your audience won't.
Visualize the Beat
If you are using Stage Monitors, OnCue, or OnSong Connect you can configure OnSong to flash external displays in time with yours. Configure visual metronome settings in Settings » Live Settings » Metronome » Visual Settings.