This song by Jam Hsiao 萧敬腾 is in C# and D.

These are the “cheat” chords I played…
Part 1a: C#2 - Fm7 - F#2 - F#m6/G# - G#
Part 1b: C#2 - Fm7 - F#2 - D#m7 - F4 - F7/A
Part 2a: F#2 - A#m7
Part 2b: D#m7 - G#11 - F#m6/G# - G#
Part 3a: C#2 - G#/C - A#m7 - A#m7/G#
Part 3b: F#2 - D#m7 - G#11
Part 3c: C#2 - G#/C - A#m7 - C#11/G# - C#/F
Part 3d: F#2 - D#m7 - G#11 - F7/A
Part 4a: A#m7 - F7/A - A#m7/G# - D#7/G
Part 4b: D#m7 - G#11
Part 5: D#m7 - C#/F - F#m - G#11 - A11
Part 6a: D2 - A/C# - Bm7 - Bm7/A
Part 6b: G2 - Em7 - A11
Part 6c: D2 - C#dim - F#7 - Bm7 - F#7/A# - D11/A - D/F#
Part 6d: G2 - Em7 - F#4 - F#7/A#
Part 7a: Bm7 - F#7/A# - Bm7/A - E7/G#
Part 7b: Em7 - A11 - A/G - F#m7 - B7
Part 7c: Em7 - D/F# - G - A11 - F#7/A# - A
Part 7d: D2 - DM7 - G/D - Dm7 - D2 - DM7 - G/D - DM7 - D2

Tags: cheats, easy, easy play, how to play, Jam Hsiao, karaoke, marry me, piano, progressions, shortcuts, simplified, singalong, tabs, 萧敬腾

This song by Styx is in D.
Part 5 and 6 are the interlude.

These are the “cheat” chords I played…
Part 1a: Bm7 - Em7 - A11 - A
Part 1b: same as Part 1a
Part 2a: Bm7 - GM7 - A
Part 2b: Bm7 - A - A11 - A
Part 3: D - Em7 - A11 - D - A11
Part 4a: D - DM7 - G/D - Bm7 - A - Bm7 - A
Part 4b: same as Part 4a
Part 4c: GM7
Part 5: D - Em7 - D - A11
Part 6a: Bb - C/Bb - Bb - C/Bb - D/A - A11 - D/A - A11
Part 6b: Bb - C/Bb - Bb - C/Bb - A11 - A - A11 - A

Tags: babe, cheats, easy, easy play, how to play, karaoke, piano, progressions, shortcuts, simplified, singalong, styx, tabs

我好想你 by 苏打绿

This song by Sodagreen is in A.

These are the “cheat” chords I played…
Part 1a: DM7 - E - C#m7 - F#m7
Part 1b: DM7 - E - C#m7 - F#7
Part 2a: DM7 - E/D - C#m7 - F#4 - F#m7
Part 2b: DM7 - E/D - C#m7 - F#7
Part 2c: DM7 - Bm7 - E11 - AM7
Part 3a: F#m7 - F#m7/E - DM7
Part 3b: F#m7 - F#m7/E - B7
Part 3c: F#m7 - F#m7/E - DM7
Part 3d: F#m7 - F#m7/E - B7/D#
Part 4a: D#M7 - Bm7 - E11 - AM7
Part 4b: same as Part 4a
Part 4c: same as Part 4a

Tags: cheats, easy, easy play, how to play, karaoke, piano, progressions, shortcuts, simplified, singalong, sodagreen, tabs, 小时代, 我好想你, 苏打绿

This song by Avril Lavigne is in G.

These are the “cheat” chords I played…
Part 1a: G2 - D/F# - Em7
Part 1b: C2 - D4 - D
Part 1c: same as Part 1a
Part 1d: same as Part 1b
Part 2a: Am7 - G/B
Part 2b: C2 - D4 - D
Part 3a: C2 - Em7 - D4 - D
Part 3b: same as Part 3a
Part 3c: Am7 - C2 - G - D4
Part 3d: same as Part 3a
Part 4a: Bm7 - C2
Part 4b: G - D - B7/D#
Part 4c: Em7 - C2
Part 4d: A7/C# - D4 - D

Tags: avril lavigne, cheats, easy, easy play, how to play, karaoke, piano, progressions, shortcuts, simplified, singalong, tabs, when you're gone

This song by Christina Aguilera and A Great Big World is in D.

Part 1a: Bm7 - G2 - D - A - A4
Part 1b: same as Part 1a
Part 1c: same as Part 1a
Part 1d: same as Part 1a
Part 2a: D - F#m7 - D/F#
Part 2b: G2 - A4 - A - A4
Part 3a: same as Part 1a
Part 3b: same as Part 1a
Part 3c: same as Part 1a
Part 3d: same as Part 1a

Tags: a great big world, cheats, Christina Aguilera, easy, easy play, how to play, karaoke, piano, progressions, say something, shortcuts, simplified, singalong, tabs