5.California Dreamin' by The Mamas & The Papas

All the leaves are brown
And the sky is grey
I've been for a walk
On a winter's day
I'd be safe and warm
If I was in L.A.
California dreaming
On such a winter's day
Stopped into a church
I passed along the way
Well, I got down on my knees
And I pretend to pray
You know the preacher likes the cold
He knows I'm gonna stay
All the leaves are brown
And the sky is grey
I've been for a walk
On a winter's day
If I didn't tell her
I could leave today
1、

The leading California-based vocal group of the '60s, the Mamas & the Papas epitomized the ethos of mid- to late-'60s pop culture: live free, play free, and love free. Their music, built around radiant harmonies and a solid electric-folk foundation, was gorgeous on its own terms, but a major part of its appeal lay in the easygoing Southern California lifestyle it endorsed.
2、All the leaves are brown，And the sky is grey
=It's lates autumn,and all the leaves are turning brown,and the sky is gray;winter is around the corner.
around the corner:在附近，正在迫近中（=be near at hand,be fast approaching）
3、I'd be safe and warm，If I was in L.A.
从语法上来说，If I was in L.A.中的WAS 应该改为WERE ，因为在表虚拟语气的IF 从句中凡表与现在事实相反的BE动词，不论主语是谁，都要用WERE
NOSTALGIC(a)怀旧的，引起乡愁的，思想病的