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A notable change in McCartney’s sound was facilitated by his switch from the Hoffner bass to a left-handed Rickenbacker 4001S, and eventually to Fender Jazz basses. This gear change produced a distinctly clearer and punchier sound, allowing McCartney to craft more intricate and complex bass lines without losing clarity in the mix. In particular, the recordings from Rubber Soul showcased an innovative approach where the bass was no longer just supportive; it stood out as a lead voice in the arrangement.