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When someone is singing out of tune, they're singing... on-key, off-key, out-key?

What musical note is this? E, F, or G?

How do you call "an organized set of special events, such as musical performances or plays, usually happening in one place, or a special day or period, with its own social activities, food, or ceremonies"?

Does Slovakia participate in the Eurovision Song Contest?

When were the Beatles formed? 1960 or 1970?

How do you call an album which is "unified by a theme, which can be instrumental, compositional, narrative, or lyrical."? Context album. concept album or conceptual album?

How is the person who "oversees the recording, mixing, and mastering of a song, ensuring its sonic quality" called? Composer, technician, mixer or producer?

What musical note is this? A, B, or C?

How do you call the "text" of a song?

How is the "digital distribution and playback of audio or video content in real-time over the internet without requiring downloading the files" called?

How do you call the "main section of a song that is repeated, featuring the song's title or main theme"?

When was Madonna born? 1958 or 1968?