Closest Android App to Unrealbook, OnSong et al is Mobile Sheets.

I have used it on an Android tablet (10") and it is okay. None of the smoothness and the feeling of "it all just works smoothly and without glitching" that you get with the iPad. But it is about the best Android one available. Works with Airturn pedals via BT

About the only thing you can get on an Android tablet is a USB or MINI USB port..Although you do need to check as it is not a "standard" for Android tablets, but is included on some models.

Oh, and the ability to increase storage by the use of SDHC SDXHC memory cards for those Android devices that have the ports.

I did try the Android system for a couple of months - went back to iOS and was very happy to do so!!!!

Hope that helps some..

Dennis