This extraordinary vocalist, whose performances at Buffalo and Rochester have created so much excitement, will make her appearance before a Lockport audience, on Thursday evening next. We cannot speak from personal knowledge of her abilities as a vocalist, but she comes to us with such high endorsements of popular favour, that we very cheerfully commend her to our citizens as an _artiste_ of the very highest order of talent, and can safely promise a rich entertainment. The _Buffalo Commercial Advertiser_ says: Miss Greenfield is about twenty-five years of age, and has received what musical education she has in the city of Philadelphia; she is, however, eminently self-taught, possessing fine taste, and a nice appreciation, with a voice of wonderful compass, clearness and flexibility; she renders the compositions of some of the best masters in a style which would be perfectly satisfactory to the authors themselves. Her low, or properly _bass_ notes, are wonderful, especially for a female voice, and in these she far excels any singing we have ever heard. We learn that this singer, (soon to become celebrated we opine) will give a concert in this city on Thursday next. There is no doubt that the novelty of hearing a coloured woman perform the most difficult music with extraordinary ability, will give éclat to the concert. All representations unite in ascribing to Miss Greenfield the most extraordinary talents, and a power and sweetness of vocalization that is really unsurpassed. Such being the case, as we are bound to believe upon good and abundant evidence, she deserves to receive the attention which is given her. Utica Daily Observer, January 13, 1852. The Black Swan had a crowded house last evening, to enjoy her voice and criticise her musical powers. The songs she gave, were in the main very difficult of execution, and well calculated to test the qualities of the Swan. The manner in which she gave "The Last Rose of Summer," elicited an encore, when she gave a specimen of her notes, which were so supernatural for a feminine, as to excite belief that a male biped was usurping her prerogative. The deepest bass of the most wonderful barytone could not surpass it, and the greatest wonder was excited. "Kathleen Mavourneen," and "O, Native Scenes," were remarkably well sung. The only failure we noticed was on some of the high notes, in pieces requiring very rapid execution, where she seemed to want that faculty of rapid and easy transition, so remarkable in Jenny Lind and Kate Hayes. We doubt not, that with proper cultivation, the Black Swan will win the high reputation as a singer, which her remarkable powers should give her. * * * * * Gratifying evidences of personal affection often found their way to her in letters like the subjoined: Utica, January 13, 1853. MISS GREENFIELD:--