How to stop music apps from changing lockscreen

if rooted + edxposed, you can use GravityBox:

lockscreen tweaks -> disable media art

tested on OnePlus 6T OOS 10.3.2 (Android Q)

There is a general way of blocking apps from changing your lock screen. Go to Settings -> Device -> Display -> Screen wakes to: and change it from "Lock Screen Notifications" to "Unlock".

Keep in mind that this will block ALL apps from changing your lock screen, not just music apps ...but it seems like only music apps use this feature anyway.

*This is for Android 6.0 but it is probably the same for Android 5.0. The exact path to this setting my be different depending on your OS.

You can achieve this by blocking all notifications from the app. This will prevent Spotify from showing any notifications, including the album art on the lockscreen. The app will still work and play without issue.

Keep in mind this also prevents Spotify from showing the play controls on the lockscreen as well, so if you want to play/pause/next-track/previous-track, you will have to open your phone. I would suggest adding the Spotify widget to your home screen so you have quick access if you need to pause playback quickly.

Thankfully, you can still control the volume with the hardware volume buttons, even if the screen is off/locked, so if you quickly need to stop music you could at least turn the volume down quickly.

Below is quick tutorial. I'm running an older version of Android but you should still have the option to Block All notifications regardless. Your options will just look a little different from mine. Hopefully this works and is sufficient for your needs!

There are 2 Xposed modules for this, I'm also a Spotify user and I hate when whatever OG rapper's explicit album art shows up on my lockscreen.

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http://repo.xposed.info/module/com.chaimchaikin.lockscreenalbumartremover

Removes full screen Album Art (i.e. when playing music) from the lock screen for Android 5.x

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http://repo.xposed.info/module/com.audio.privacy

Removes album art and title/artist information from lock screen audio controls (and any other RemoteController) On 5.0 and 5.1 only the album art hiding is effective as the controls are player specific. If you want to hide these too, set a password and configure your phone to hide notifications for your player.

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I use the second one because I'm on Kitkat. Haven't had any issues.

You'll need a rooted phone to install Xposed framework, but it's definitely worth it. (GravityBox/XBlast Tools are the most common add-ons, which let you customize SystemUI -- status bar colors, clock, screen off animation, etc.)

This option isn't implemented in the spotify app yet. This has been posted on the Spotify community forum as a "New Idea" - Option to disable album art on lock screen and is still in the same status.

The only way I could think you can turn the album art on lockscreen off is by completely turning off the notification for Spotify app(Settings -> Sound & notifications -> App notification -> Spotify -> Block). But this would hide all the notifications.