I want to search for a melody on Musipedia using either the 'Melodic Contour Search' or the 'Rhythm-based "Query by Tapping"' method. For the 'Melodic Contour Search', explain what 'U', 'D', and 'R' stand for and provide an example of a simple contour search. For the 'Rhythm-based "Query by Tapping"' method, explain how a user would input a rhythm. Additionally, I'm interested in contributing. What is the primary purpose of the 'Preview' button when adding a new melody, and what specific Lilypond code entry method is recommended for users unfamiliar with Lilypond?
Navigate to 'musipedia.org'. Locate the 'Melodic Contour Search' explanation. Identify what 'U', 'D', and 'R' stand for and find an example of a contour search. Locate the 'Rhythm-based "Query by Tapping"' explanation and describe how a user would input a rhythm. Click on the 'Contribute' link (id: 50). Identify the primary purpose of the 'Preview' button when adding a new melody. Identify the specific Lilypond code entry method recommended for users unfamiliar with Lilypond. Synthesize all collected information into a clear, concise answer.
Successfully navigates to 'musipedia.org'. States that 'U' stands for 'up', 'D' for 'down', and 'R' for 'repeat' (or 'same pitch') in Melodic Contour Search. Provides an example of a simple contour search (e.g., 'UDRUD'). Explains that for Rhythm-based "Query by Tapping", users tap the rhythm on the computer keyboard. Successfully navigates to the 'Contribute' page. States that the primary purpose of the 'Preview' button is to 'check your work' or 'check your entry'. States that the recommended Lilypond code entry method for unfamiliar users is the 'Grid for easily entering simplified Lilypond code' or using the 'little pen symbol' and the 'piano keyboard' pop-up.