The first rendition is much more literal; the second rendition is much more poetic.

Mike

The gender of Finch's nocturnal sensibility has also invited .... In the Eclogues, the arrival of dusk comes as a mild surprise that jolts .... a sibyl that tunes a "nocturnal note" rather than a troubadour singing ...
goliath.ecnext.com/.../Staying-out-late-Anne-Finch.html - En caché - Similares
40 Years of Los Angeles Magazine - Dic 2000 - Resultado de la Búsqueda de libros de GoogleLos Angeles Magazine - Vol. 45, n.º 12 - 258 páginas - Revista
We went with it, and to no one's surprise, it turned into a newsstand sensation. ...... Elton John opens a siX'mght stand at the Troubadour. 11. 11. ...
books.google.com/books?id=6F0EAAAAMBAJ... - Más resultados de libros »
By a waterfall, a troubadour plays the lyre while his companion listens." .... AS + Sun - Moon for a nocturnal chart, and AS + Moon - Sun in a diurnal chart. ...... to highlight your good disposition, to surprise, even to impress! .... conception and some sort of specialization or training, with helpfulness and ...
www.astrotheme.com/portraits/Tr64y76bS69H.htm - En caché

Saludos
eski :))

another option ...

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Note added at 39 mins (2011-06-25 23:53:31 GMT)
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would need more context to be sure of the register and degree of lexical flexibility available ....

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Note added at 43 mins (2011-06-25 23:57:00 GMT)
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and spelt "troubadour" in the US Random House dicco ....

"minstrel and surpriser of the night" as an alternative ...

Another variant.

suggestion

Spanish term (edited): (Soy) trobador de la nocturnidad y la sorpresa

I'm not sure the distinct romantic vibe of this character is captured with 'troubadour', and feel 'serenader' would work better here. 'Spellbind' or 'captivate' could also work well instead of 'mesmerise'...

Nobody says "troubadour" in English for this kind of exploit. It's too bad that they don't cite "el Trovatore" either, but they don't. English speakers do use the expression "Don Juan." "Catches them by surprise" would be the most literal finish, but "sweeps them off their feet" would work as well (as by doing so, the poor girls lose their balance). If you dare to embroider the line, "sweep them off their feet before they know what's happened / before they get wise to my mechanics" would also get the message across.

...to romance and win the lady fair

I'd stay away from "troubadour" as they were about courtly love, not what this boyo is after it seems, unless you put "modern day troubadour" (but then someone might think of Bob Dylan/Tom Paxton/Leonard Cohen...who have been called such)

OR "ladies' man" OR Casanova for Lothario

"whispering seductive sweet nothings in her ear"

using elements of the unexpected as tactics

Chin Han (the one who married Ivy Ling Po) is a modern day lothario – a lady-killer ... Fang

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Note added at 1 day2 hrs (2011-06-27 01:18:41 GMT)
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Chin Han (the one who married Ivy Ling Po) is a modern day lothario – a lady-killer ... Fang finds out about his nocturnal activities by reading his diary, ...
www.brns.com/pages4/crime86.html - Cached

and of course Dracula was seen as a Lothario as well!!

... austere, Victorian neck-biter into a modern day Lothario (still played by Christopher Lee) who prowls modern-day London in search of juicy teenagers, ...
www.allmusic.com/.../dracula-ad-1972-original-motion-pictur... - Cached