The melody of Summertime by Janis Joplin runs 91 notes across 18 bars, 2:16 long in Em at 90 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Summertime chords and lyrics.