Oh me. There are a lot of choices to select from! I am choosing totally opposites here:
Itzhak Perlman, Tchaikovsky: Concerto in D for Violin and Orchestra, Op. 35, London Symphony Orchestra -- choice track - "I Allegro moderato" (all 17:18 of it). Chesky Records 1988, CD-12.
Nickel Creek, choice tracks "Reasons Why" and "When You Come Back Down" Sugar Hill Records, 2003, SACD. Both are different in music their genres and recording technologies, but each are awesome in their own right. The clarity of the strings rule in both instances. The violin cries with emotion and the mandolin and guitar warm the soul. A true test for your speakers!