I am considering to buy an Android tablet, but one of my requirements is that I can use some sort of music player with which I can easily schedule songs. A bit like the functionality of Clementine on Linux, where I can drag songs from the folder pane on the left to the playlist pane on the right. The idea is to attach an external harddisk with flac/mp3/ogg files.
Now I understand that Android is an entirely different platform with respect to a desktop Linux, and the programs will probably look different to optimize for touch interface. So I know I mustn't look for Clementine, but for a application that has similar functionality. So far all music players I've seen searching the Internet all have a very basic interface, mostly showing only the [Play] [Pause] [Next] [Volume] controls.
Are there any decent music players that can do this and that can read data from external USB disk?

jukefox, which is quite good at it's job. The current release does have some little issues with large music libraries ( >7000 ). Especially the cloud-like graphical representations don't cope with the huge number of tracks/albums/artists. – jippie Jun 10 '12 at 17:32