If you are trying to work out stresses in speech, a linguist friend showed me a great trick. As you read your lyrics, use 'uh' or 'um'. I use it when training my Chinese students in poetry. You can here the major and minor stresses very easily.

Mary had a little lamb
Mm m(M) m Mm M

Bold = main stress
M = minor stress.

There are regional variations (and I'm English)

Another quick trick is to see what words are needed to make sense
Mary had little lamb.

The dog is big
m M m M
dog big.

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