Qechoprint is a project mainly written in C++, it's free.
Qt-based music identify app powered by EchoNest
QEchoPrint is a Qt-based application for music identification based on awesome open-source EchoPrint project by EchoNest. It designed for Maemo/Meego platforms, but also runs on Linux/Mac/Win desktops and should work on Symbian devices. Contributions are welcome.
The app is in alpha stage, thus not released to Maemo/Meego repositories. I will be added as soon as it be considered ready.