Personally, i like the Molgera Battle in The Legend Of Zelda; Windwaker. I put it top priority to any music
Mario Games : 1st place : SMRPG : Forest Maze.
Reasons: 1) Very catchy
2) Very addicting
3) Good for sing-a-longs xD
2nd place : Super Mario Bros. 1 Level 1-1
Reasons: 1) Instant classic
2) Also very catchy
3rd place : Mario Kart Series : Rainbow Road
Reasons: 1) It fits the race
2) Its epic
That's all for now.