You could google this, but the ratio between frequencies of one octave to the next is 2:1
        
             
        
        
        
Answer:
'Twinkle Twinkle Little Star' in the key of C major
Explanation:
(Picture)
 
        
             
        
        
        
Thick texture because texture has nothing to do with music
        
             
        
        
        
Answer:
Hugo van der Goes- religious symbolism in the Portinari Altarpiece
Matthais Grünewald-  continued late medieval artistic traditions
Hans Holbein the Younger-  precise and detailed portraits