Copenhagen's Marie Mørck releases her third album, My One and Only Love, as a 20-something up-and-comer on the Danish vocal jazz scene. Her well-received earlier projects contained originals and ...
Look For The Silver Lining; Are You Havin' Any Fun?; Like Someone In Love; Young At Heart; I'm In The Mood for Love; My One And Only Love.
AOL: EXCLUSIVE: How Priscilla Presley Will Go To Her Grave Yearning For 'One and Only Love' Elvis
Priscilla Presley will go to her grave yearning for her "one and only love" – the late Elvis Presley – after admitting no man has ever come close to matching the King of Rock and Roll, RadarOnline.com ...
EXCLUSIVE: How Priscilla Presley Will Go To Her Grave Yearning For 'One and Only Love' Elvis
The 'one hand' could be any generic hand (no article) or a specific one (definite article). 'The other' refers to the 'matching hand' of the first one. There can only ever be one, and it is being referred to explicitly as the partner of the first, therefore it needs a definite article.
Both 'a single' and 'one single' are correct and commonly used phrases in English. They are interchangeable and can be used to emphasize the singularity of an item or person.
The difference is that "one" puts more emphasis on the number such as I have 4 computers and a printer/I have 4 computers and only one printer. So when you say a feature of my work or one feature of my work, it means the same, with the only difference that "one" is emphatic compared to "a".