There is no definitive answer to this question, as the level of difficulty in mastering a musical instrument can vary depending on factors such as personal skill, natural talent, dedication, and practice time. However, some experts may argue that instruments such as the violin or piano require a particularly high level of technical proficiency, while others may argue that instruments like the bagpipes or the sitar require a greater understanding of cultural and historical context. Ultimately, the "hardest" instrument to master is subjective and can vary depending on personal perspective and opinion.
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