Crossword Puzzle Page - classical music, composers, knowledge and instruments

If you manage to complete this crossword, follow the secret directions which will appear (in the yellow squares) and I will add your name to my musical genius hall-of-fame for the rest of the world to see, admire and aspire to. Have fun and good luck!

1.   - - - corda, meaning three strings - used for the left piano pedal. (3)
2.   Second note of the sol-fah system. (2)
3.   Composed 41 symphonies & 37 violin sonatas. (6)
4.   First word of the name of a work by three down! (4)
5.   Type of whistle used in Irish folk music. (3)
6.   Britten's lifelong companion and inspiration - Peter... (5)
8.   The Sound of Music (4)
9.   Time and key are two examples (10)
10   Opposite of 26 across (9)
11    English term for an american quarter note (8)
12   - - - - - - - and Lightening Polka (7)
17   Succession of sounds which achieve distinctive musical shape (6)
19   At a walking pace (9)
20   Fixed pattern of notes in an ascending or descending order (5)
28   The sign indicating that the note is to be lowered by one semitone (4)
30    Instrument that sounds like a shipping line! (5)
31   Italian - sweet, gentle (5)
32   Device used to soften the tone of an instrument (4)
33   One of the four main singing voices (4)
36   To be musical is said to have an - - - for music (3)
37   Shortened name for written guitar chords (3)

1     Brass instruments with two parts, based on the sackbut (8)
7     See 2 down (2)
5     Found in a daffodil (7)
9     Opposite of 28 down (5)
11    Instrument with a range from the E below middle C to the A three octaves above it   (8)
13    Third note of the sol-fah system (2)
14    First note of the sol-fah system (2)
15    Percussion instrument, often used in gospel music (10)
16    Musical film - Wizard of ...? (2)
18    Intervals between first and eighth and fifteenth notes of a diatonic scale (7)
21    First note of the Guidonian hexachord (solmization) (2)
22    Mediant, dominant and tonic in the key of C major (3)
23    Sign used to determine pitch of lines of a stave (4)
24    Vibrating element in many musical instruments (4)
25    A long, long way to run, says Julie (2)
26    With the bow - con   - - - - (4)
27    Literally "at pleasure" - - lib (2)
29    Two people (3)
30    You'll find this at the bottom of a piano (5)
32    German - "with" (3)
34    Classical, Baroque, Romantic - all descriptions of a musical - - - (3)
35    Stringed instrument popular in the 16th/17th century (4)
37    Rossini overture - William... (4)
38    Composer of the opera Fidelio (9)
39    Italian musical term - literally "robbed" (6)