Requirements

0.1

On-line mode only
Basic functions
search (for a track, an album, an artist or all - only one search criteria at a search)
play (found track, album, artist)
One playlist available only (current)

Icon on the system task bar
Icon expands to a search box (focus on it) and buttons "Settings", "Login/Logout", "Playlist", "Quit" below the search box
Typing into the search box automatically creates a scrollable list view with search results
Available search criteria: "t:" track name, "a:" artist name, "l:" album name
When only one search criteria is used only results for that criteria is displayed
When no criteria is used then list with results is split into three sections
When more than one criteria is used then the search results list is split into sections matching only that criteria
User can move through search results with arrows (up/down)
Pressing "Enter" results with
adding a track/album/artist to the playlist
jumping to selected track
closing search results
Pressing "Alt/Opt+Enter" results with
adding a track/album/artist to the playlist
Albums and artist search results should be expandable
There should be icons (e.g. "+") on the right to tracks/albums and artists to enqueue them to the playlist

When selected track finishes then and no other items are enqueued:
and if user enqueued a single track the next ones from the same album are played, up to end of that album
and if user enqueued a specific album only that album is played (or next one by production year?)
and if user selected an artist the next track from currently played album and then from the next albums are played
If user has earphones plugged in and locks the screen (or screen-saver kicks in) then music should be paused; music should start to play again when user unlocks the screen
Balloon tip when new track starts (?)