Рассмотрите фрески Дионисия Ферапонтова монастыря. Какие образы запечатлены на них?
Какими художественными средствами художник воплощает идею таинственного духовного света?

Если помните, в чистой кварте 2,5 тона, а в чистой квинте – 3,5, вот так и выходит, что если кварту увеличить на полтона, а квинту уменьшить, то тоновая величина их сравняется и будет равна трём.
Про простые интервалы (про кварту и квинту) можно почитать вот тут.
В любой тональности нужно уметь находить две пары тритонов. Пара – это ув4 и ум5, которые взаимно обращаются друг в друга. Одна пара тритонов всегда есть в натуральном мажоре и миноре, вторая пара – в гармоническом мажоре и миноре (пара характерных тритонов).
В вам вот такая табличка по сольфеджио – тритоны на ступенях лада.

I don't wanna die or fade away

I just wanna be someone

I just wanna be someone

Dive and disappear without a trace

I just wanna be someone

Well, doesn't everyone?

And if you feel the great dividing

I wanna be the one you're guiding

'Cause I believe that you could lead the way

I just wanna be somebody to someone, oh

I wanna be somebody to someone, oh

I never had nobody and no road home

I wanna be somebody to someone

And if the sun's upset and the sky goes cold

Then if the clouds get heavy and start to fall

I really need somebody to call my own

I wanna be somebody to someone

Someone to you

Someone to you

Someone to you

Someone to you

I don't even need to change the world

I'll make the moon shine just for your view

I'll make the starlight circle the room

And if you feel like night is falling

I wanna be the one you're calling

'Cause I believe that you could lead the way

I just wanna be somebody to someone, oh

I wanna be somebody to someone, oh

I never had nobody and no road home

I wanna be somebody to someone

And if the sun's upset and the sky goes cold

Then if the clouds get heavy and start to fall

I really need somebody to call my own

I wanna be somebody to someone

Someone to you

Someone to you

Someone to you

Someone to you

The kingdom come, the rise, the fall

The setting sun above it all

I just wanna be somebody to you

I just wanna be somebody to someone, oh

I wanna be somebody to someone, oh

I never had nobody and no road home

I wanna be somebody to someone

And if the sun's upset and the sky goes cold

Then if the clouds get heavy and start to fall

I really need somebody to call my own

I wanna be somebody to someone

Someone to you

Someone to you

Someone to you

Someone to you

Someone to you