Open issues on query by humming

Songs are considered the major source of entertainment for the people of all age groups. With the wide spread growth of World Wide Web. Various resources are available and accessible. The high availability of audio music content is bringing significant problems and the relevant songs retrieval being the foremost. Searching of audio files on the basis of its content is the most effective way, especially in the case when supportive information (metadata information) of the file is missing or incomplete. In this paper, we aim to discuss the famous content based searching technique, Query by Humming (QbH) along-with the other existing techniques in the domain. We have highlighted certain open issues and key challenges that need to be address by the research community for the advancement in the domain. The discussion is supported by conducting surveys to study the importance of these highlighted issues for the relevant songs retrial.