From Dennis Daume:
Espera is a music player written in C# with WPF as frontend technology. It is designed as party-player, as it offers features such as locking the player and allowing only to add a certain amount of songs to the playlist at a certain time, or adding music from YouTube to the playlist and streaming the audio track of the video directly. Espera allows to lock itself, this comes handy on parties, where the guests shouldn't be able to change the volume or stop the music, but still be able to add songs to the playlist. Espera can search songs at YouTube, add them to the playlist and download/stream the audio track. Espera has built-in support for adding music from MP3-players and other removable devices to the playlist. Espera uses MahApps.Metro for themes.
What's new in this version:
Version 1.7.6 has fixed the settings not being fully accessible in a small window.