给出一组音乐曲目，将它们按照流派分类。输出已分类的曲目列表。
音乐列表：
1. Rhapsody in Blue - George Gershwin
2. Hotel California - Eagles
3. Thunderstruck - AC/DC
4. Stairway to Heaven - Led Zeppelin
5. Symphony No. 9 - Beethoven
6. Purple Haze - Jimi Hendrix
7. I Will Always Love You - Whitney Houston
流派分类：

古典音乐：
1. Symphony No. 9 - Beethoven

爵士乐：
1. Rhapsody in Blue - George Gershwin

摇滚乐：
1. Hotel California - Eagles
2. Thunderstruck - AC/DC
3. Stairway to Heaven - Led Zeppelin
4. Purple Haze - Jimi Hendrix

流行音乐：
1. I Will Always Love You - Whitney Houston