Tower of Power | So Very Hard to Go

Tower of Power‘s biggest US hit wasn’t one of the powerhouse uptempo funk tracks for which the band is famous. Instead, it was a ballad, “So Very Hard to Go,” which reached #17 on the pop charts in 1973. The verse and pre-chorus are in Bb major, but a modulation to G major hits at the chorus, reverting back to Bb major for the second verse, and so on.

Aretha Franklin | United Together

Aretha Franklin was a legendary soul/gospel/R&B/pop vocalist — but also a civil rights icon and humanitarian.

Though it wasn’t one of the mega-hits among her huge catalog, this track clearly shows Aretha’s warm, dignified persona and the uncontainable range of her artistry. “United Together” (1980) modulates at 3:50.

Stevie Wonder | Where Where You When I Needed You

Another gem from Stevie Wonder‘s deep catalog of classics: “Where Were You When I Needed You.” Released as a B-side in 1972, it was one half of a two-part medley (along with “Superwoman”). The sound was truly ahead of its time, featuring multi-layered synths and state-of-the-art production. Key change at 2:06.

The Stylistics | Stop, Look, Listen

Another harmonically lush track by the Philly Soul gurus The Stylistics. “Stop, Look, Listen” (1971) packs so much into a hit song of less than three minutes’ length — including a few time signature shifts, plenty of orchestral instrumentation, and an uncharacteristically simple direct modulation at 2:21.

Marvin Gaye | What’s Goin’ On

Marvin Gaye’s soul/R&B classic “What’s Goin’ On” (1971) modulates at 1:38 and then back to the original key at 2:06 as it transitions into another verse. Gaye’s consistent use of 7th chords only added to the track’s rich harmonic tapestry. Rolling Stone ranked the album featuring the single #6 on its list of “The 500 Greatest Albums of All Time.” From AllMusic‘s reverent review: “What’s Going On is not only Marvin Gaye‘s masterpiece, it’s the most important and passionate record to come out of soul music, delivered by one of its finest voices .. Gaye meditated on what had happened to the American dream of the past … arguably the best soul album of all time.”

The Stylistics | Betcha By Golly Wow

In the 1970s, Philly Sound/Philly Soul was similar to Motown, yet also distinct from it — mostly due to its more adventurous harmonies. The Stylistics, one of most popular groups working in the genre, scored 12 R&B top ten hits in a row in the 70s.

This 1971 release changes key twice during the 30-second intro alone (0:14 and 0:28) — pivot modulations aided by colorful compound chords.

Stevie Wonder | I Never Dreamed You’d Leave in Summer

A lesser-known beauty from 1971 — a slice of “Little Stevie” Wonder’s nearly bottomless catalog of musical miracles. Co-written by Syreeta Wright, the tune only made it to #78 on the Billboard Hot 100, but it remains one of the most enduring of Stevie’s many ballads. Modulation at 1:41.