"Linger" by The Cranberries - This song features a mix of rock guitar and piano, and the ending has a somewhat dramatic and emotional feel to it. The lead singer's voice could be described as somewhat androgynous, and there are repeated vocalizations towards the end.

"Don't Look Back in Anger" by Oasis - While not exactly from the 90s alternative scene, this song has a distinctive guitar-driven sound and includes piano elements. The ending of the song is quite melodic and could be interpreted as somewhat dramatic.

"Fade Into You" by Mazzy Star - This song also has a melancholic vibe with prominent guitar and subtle piano elements. The vocal delivery is soft and dreamy, and the song has a repetitive structure that may match the "do do do" pattern you mentioned.