What's the name of the application? I had asked this questions many times before and this is the first time someone tells me that such application exist. I would be thrilled if you would share this info with me.
Yes, all my music playlists combine normal musics and music videos, and I have the habit of listening to them while using all kinds of applications in the foreground.
I guess that depends very much on what Cydia applications have been installed. It can be perfectly stable if the errant applications and tweaks are not installed.
This is just one app out of many (some of the players probably incorporate those things as well, but I don't use an android phone at the moment):
https://play.google.com/store/apps/details?id=com.silentlexx.volbtntrackctrl&feature=related_apps#?t=W251bGwsMSwxLDEwOSwiY29tLnNpbGVudGxleHgudm9sYnRudHJhY2tjdHJsIl0.
One example of an app that can play almost anything video service in background:
https://play.google.com/store/apps/details?id=jp.co.asbit.pvstar&hl=en
And for combined playlists:
https://play.google.com/store/apps/details?id=com.real.RealPlayer&feature=related_apps#?t=W251bGwsMSwxLDEwOSwiY29tLnJlYWwuUmVhbFBsYXllciJd
https://play.google.com/store/apps/details?id=com.bsplayer.bspandroid.free&feature=related_apps#?t=W251bGwsMSwxLDEwOSwiY29tLmJzcGxheWVyLmJzcGFuZHJvaWQuZnJlZSJd (can play even files from rar archives and connected USB drives)
This is just from a simple google search only....
As for errant tweaks, just have activator, auxo, zephyr, ifile, and pwntunes and if my iPhone still acts crazy then I refuse to accept that this is what people call "stable". Just 5 basic tweaks and they are enough to make me phone unusable at times, good going.