A web application which incorporates the melody transcriber that was originally developed at ELIS-UGent [see De Mulder, Martens, ... (2004). "Recent improvements of an auditory model based front-end for the transcription of vocal queries", procs. ICASSP, 257-260] can be tried at   http://api.samplesumo.com (on the website of SampleSumo, a spin-off company of the UGent).