These lines, most incomparable friend, are intended to introduce to you Carl Klindworth, about whom I have spoken and written to you several times. You will find him an excellent musician and pianist, who is cordially devoted to you, and has not in vain lived several years with me at Weymar. Since last year he has been settled in London, where I cordially commend him to your protection.
Franz Liszt
Source: Project Gutenberg eBook #4234, Correspondence of Wagner and Liszt — Volume 2, No. 176