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In this paper, we present and discuss the evaluation process of a middleware system that we have developed. Our system facilitates the access to digital music libraries in push technology-based mobile services. Specifically, our system provides a semi-automatic interface that allows users to interact with a digital music library and find/retrieve music files in a flexible way based on a combination of mobile technologies and content-based retrieval techniques. The evaluation process followed three stages, namely user background information collection, system performance evaluation, and overall system assessment. The evaluation results are quite positive in terms of both system performance evaluation, and overall system assessment.