Lyric poetry is a fairly broad genre of poetry; however, there are basic key features of lyric poems. More often than not, a lyric poem is written from the first person perspective. That means that the speaker of the poem is also involved in the poem itself. Lyric poems also tend to be short. They can be long, but they usually are not long. Almost without exception, lyric poems focus intensely on some mood or emotion. It could be any emotion, but more often than not, the emotion is love. The last characteristic of lyric poetry is the lyrical nature of the poem itself. Lyric poems usually have very consistent rhyme scheme, rhythm, and meter.
John Donne's poem "Go and Catch a Falling Star" is a nice example of lyric poetry. It's short. The poem is 3 stanzas long, and each stanza is not long. It has a regular rhyme scheme (ABABCCDDD). The rhythmic meter is mostly iambic tetrameter. Lines 7-8 of each stanza drop to monometer. The subject of the poem is about love. . . sort of. The speaker is searching for the perfect woman, but he knows that is as impossible as "catching a falling star."