Much like its title screen counterpart "Welcome to Dream Land", "A New Wind for Tomorrow" plays in C major at 4/4. It begins with a short intro segment consisting of a sequence of three rising notes, similar to the middle section of "Green Greens". Its melody starts on the first beat of the bar with a dotted rising fourth to the tonic, followed by a slowly ascending passage back to the dominant. The second phrase descends the tonic triad and ends on a dominant harmony. The first phrase repeats, but in place of the second phrase comes a subdominant harmony, where its resolution leads to a brief A minor landing. Upon several harmonic progressions the dominant is once again reached, and a brief descending arpeggio in unison is followed up by the repetition of the first section with a different ending.
The middle section plays in A major with a harmonized melody. This section has descending tendencies despite still featuring the trio of rising notes. Another harmonic progression leaves this section on an A major sixth before a sequence of chords that helped transition to this section leads back to a longer and more harmonized intro section culminating in dominant triplets, after which the track loops.
In Kirby's Dream Collection Special Edition, in addition to its appearances in the appropriate Classic Titles, a new orchestral version of the theme is used for the credits of New Challenge Stages, combined with part of "Sky Tower". Near the end of the credits, the song fades into the original version from Kirby's Dream Land before the orchestra fades back in for the very end. The title on the Playbutton included with Kirby Star Allies: The Original Soundtrack is バイバイカービィまたあした! (Bye Bye Kirby, See You Tomorrow!)
The original theme from Kirby's Dream Land is used for the main credits sequence.
An intense minor-key version of the song is used in the Secret Path. On Kirby Star Allies: The Original Soundtrack, this remix is titled あしたはあしたのだいけっせん (A Great Battle for Tomorrow).
A rearrangement of the theme is used for the secret credits theme.
Kirby Star Allies
There are four distinct uses of the theme in Kirby Star Allies, as follows:
In the stage Clash at Castle Dedede, the theme is combined with "King Dedede's Theme". On the soundtrack, the theme is titled ゆうかんなるものたちへ (For Those Who Are Brave).
Despite not having its own dedicated track in Kirby and the Forgotten Land, "A New Wind for Tomorrow" is heard during the end cutscene in "Soaring Determination: No Night Is Eternal", marking its first use as a leitmotif.
Kirby's Dream Buffet
In Kirby's Dream Buffet, "A New Wind for Tomorrow" can be unlocked to play in races, on the Home Table, or in Free Rolling upon reaching a Gourmet Rank of 132. It is known in this game as "Kirby's Dream Land: Memorial Song 2", and is taken directly from Kirby's Dream Land.
Super Smash Bros. series
Super Smash Bros. Ultimate
SmashWiki has more information about this subject here.
In Super Smash Bros. Ultimate, this theme is combined with "Milky Way Wishes: Staff Credits" to form the remixed track "Staff Credits - Kirby's Dream Land". It is prominently used for the credits when completing Classic Mode as Kirby and can also play on any Kirby series stage, Battlefield, Big Battlefield, Small Battlefield and Final Destination.
Other appearances
The Japanese version of Kirby: Right Back at Ya! has a remix of the theme, that first plays when Kirby is catching up with King Dedede and Escargoon on The Kirby Derby - Part II. It also plays during the last scene of Fitness Fiend. Another ballad based remix is also heard in various episodes such as Waddle While You Work, when King Dedede resolves to never go hungry again in the field.
"Tomorrow's wind blows tomorrow" The Japanese title is Kirby's motto in the Japanese media, and was first given as the track's name on the Kirby Ultra Super Deluxe Original Sound Track. As a figure of speech, it's roughly equivalent to the English phrase "Tomorrow is a new day" or "Tomorrow is another day" and has been used as such in other Japanese media, including translations of the 1939 motion picture Gone with the Wind.[4]
↑From the back of the officially-licensed Kirby Otamatone Melody packaging (Amazon listingimage with equivalent information; Wayback Machine snapshots exist of image and listing)