Here's the 3 songs by MEGADETH that appeared in the 2026 countdown:
RUST

HANGAR 18

MEGADETH

RUST IN PEACE 1990 5:11
2026: 1331 2025: 1031 2024: 1080 2023: 1657 2022: 971 2021: 961 2020: 504 2019: 467 2018: 837 Average: 982
COUNTDOWN

SWEATING BULLETS

MEGADETH

COUNTDOWN TO EXTINCTION 1992 5:27
2026: 1084 2025: 1203 2024: 1499 2023: 971 2022: 1045 2021: 832 2020: 859 2019: 733 2018: 401 2017: 547 2016: 559 2012: 895 Average: 886
RUST

TORNADO OF SOULS

MEGADETH

RUST IN PEACE 1990 5:19
2026: 1034 2025: 780 2024: 513 2023: 598 2022: 577 2021: 588 2020: 627 2019: 770 Average: 686