Android Lollipop Music - Playlist and search

[AC Question]

Hello,

I'm quite new to Lollipop / Android on a Pad. I try to use the music-app which
comes with Lollipop but I'm not able to search for a song within this app.
Isn't there such a fuction? I know that on my old pad with Jelly Bean I had the
possibility to search.
The other problem is that every time I created a playlist all songs within this list are
gone after a new start/unlock (standby)?
All my songs are on a sd-card which I never unmount from the pad.
Any help would be appreciated.
Many THANKS!
Andi