The first features Hilary Hahn on violin and is on the CD Elgar - Violin Concerto; Vaughan Williams - The Lark Ascending [SACD]
The second is Vaughan Williams: Tallia Fantasia; Fantasia on Greensleeves; The Lark Ascending etc.
which, as the title suggest, has the added bonus of also having "Fantasia on a Theme by Thomas Tallis" and "Fantasia on Greensleeves"(If I had to choose I would go with the second)
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