No
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The noun phrase 'my favorite singing group' is a common noun.A proper noun is the name of a specific person, place, or thing. A proper noun for the common noun 'singing group' is the name of a singing group, for example, The Rolling Stones, The Beatles, or the Mormon Tabernacle Choir.
The youngest in the Korean Singing group BIGBANG is Seungri [ V.I ] or by his full name Lee Seung-hyun
The noun for a four person singing group or musicians is a quartet.
The Four Pound Signs
Yes, you should always underline the name of something, except the names of people.
No.
Italicize or underline the title.
Bono
No. A film title should be set in title case, for example, The Wizard of Oz. If you are being thorough, then set the name in italics, for example, The Wizard of Oz.
His group was "The Sons of the Pioneers"
"PIGBAG "is one "BLODWYN PIG" is another.
underline the name of a magazine but quote the names of the articles.
u2
maroon five
Choir
SENT