Madam, - Andrew Johnstone's review of last Friday night's concert by the National Symphony Orchestra (Arts, November 18th) does not mention what to many may have been the most moving moment of all. During the warm applause for Tchaikovsky's Symphony No 6, the conductor, Vladimir Altschuler, held up his score and pointed to it in tribute to the composer. This graceful and unusual gesture certainly drew this member of the audience to her feet. - Yours, etc,